View Full Version : AC160 to HPX250: I'm Tempted


Nate Haustein
March 12th, 2013, 07:27 PM
Tempted to get me some of that 10-bit AVC-Intra 100 goodness.

I like using my AC130/160 cameras. I really do. What I don't like is how the codec behaves when I try to grade it or how lots of motion breaks it apart. Just for fun, I was looking on B&H at the HPX250 and saw that the prices have really come down. Can anyone point me to a comparison of the AC vs the HPX, or offer any experiences? I like the idea of shooting higher quality 10-bit footage, especially when I'm being hired on as a shooter for other productions and I don't have as much control over the final product. Then there's the problem of matching up what would be the remaining AC130 with the HPX. Possible? Can they get close enough at least for the occasional live event? Or do I sell both and do HPX250 + AC90 to offset the cost?

Is that image quality all that it's cracked up to be compared to AVCHD, or am I seeing the greener grass on the other side? Still, I supposed its smartest to wait until after NAB...

David Heath
March 13th, 2013, 02:40 PM
I like the idea of shooting higher quality 10-bit footage, ...........

Is that image quality all that it's cracked up to be compared to AVCHD, or am I seeing the greener grass on the other side?
Two separate issues - 10 bit and AVC Intra 100.

AVC Intra 100 will give better quality (certainly in post manipulation) than AVC-HD, but that's far more likely to be down to the inherently lower compression of AVC Intra 100 than the 10 bit nature. Main reason is that for the HPX250 (and probably most other 1/3" cameras) the noise level is likely to be substantially worse than the range that an 8 bit system can deal with. Move to 10 bit, and all you're really doing is more accurately defining the noise!

That said, then even with 8 bit acquisition, there may be advantages to doing a transcode to a 10 bit codec before doing editing and effects etc. (And a codec less compressed than AVCHd in other ways.)

In other areas, then have you looked at such as the XF305? It's a little more expensive than the HPX250 for basic camera, but media costs per hour are far less so a basic camera plus media package may not work out any dearer - depends on the recording time you want. In many respects the cameras are comparable, but IMO the big advantage of the XF305 is regarding manual mode - the control of aperture and focus are true manual - not via servos as with the HPX250.

Nate Haustein
March 14th, 2013, 12:35 AM
Thank you for the clarification, David. I do believe my understanding of 10-bit and its relationship to data rate was somewhat incomplete. From reading a few other posts of yours on the matter, it seems that 10-bit may not be the magic bullet for capturing footage that behaves like silly putty in the edit suite. My original take was that the 10-bit would "see" more into the highlights and shadows, but apparently the real advantage is the reduction of banding? I was quite impressed (still) by some HVX200 footage I shot the other day with a friends camera. The color grading seemed to work so well and I assumed it was the 10-bit recording format. Shooting conditions were not ideal, but I was amazed at his much I could get back in highlights and push the color. However, I believe that DVCPRO HD is only 8-bit itself! Now, is it my imagination or is it simply the data rate of the footage giving me better quality?

The part about the inherent limitations of a 1/3" camera is also very important and I can definitely see the issues there. I think I want the images out of a 2/3" camera but am only half way there with the class of cameras I'm using. AVCHD hides a good amount of noise compared to uncompressed out, which can be a blessing and a curse.

I think in the end, I'll just need to try a little harder with my current AC160. With the SDI out and Hyperdeck recorder going to ProRes, I see no reason why I can't get great results. Perhaps this weekend will need to be devoted to finding a scene file and workflow that meets my expectations. Thanks again for your post.

David Heath
March 14th, 2013, 12:24 PM
My original take was that the 10-bit would "see" more into the highlights and shadows, but .....
That would only be true if the front end of the camera (and especially the intrinsic noise level) was good enough for the extra in highlights/shadows to be there in the first place. With a 1/3" camera that's not likely to be the case.
.........apparently the real advantage is the reduction of banding? I was quite impressed (still) by some HVX200 footage I shot the other day ........ I was amazed at his much I could get back in highlights and push the color. However, I believe that DVCPRO HD is only 8-bit itself!
Bit depth issues *MAY* give rise to banding, but banding is far more likely to be down to general compression issues - and I think that's exactly what you've found when you talk about your experiences with DVCProHD. (Which, as you say, is also 8 bit.)

I think most people can intuitively see why bitdepth may give rise to banding, but why compression should do it is probably not as obvious. If anyone wants proof, (and doesn't like theory! :-) ) then there's a very quick test you can do in Photoshop in less than 5 minutes. Make a new (blank) canvas, then select a narrow vertical strip on the left hand side and fill it with black. Select the gradient tool, and draw a line from the black area to the (white) right hand side of the canvas - the image should be a nice smooth black-white gradient left to right. Now try saving it as a JPEG - firstly with low compression, then with the highest level (quality=0).

Anybody still unconvinced that banding may be caused by over compression alone!? :-) If you want the (very basic) reason why, read on, if you don't like theory, skip the next paragraph!

(In basic form, compression such as JPEG will initially take the image and divide it up into blocks, typically 8x8 pixels. First step is to find the average value for the block - that is then stored, together with difference values for how much each of the 64 pixels differ from that average. The higher the compression level, the less accurate the difference values can be, until in the extreme all that can be stored is the average block value, which will apply to the entire 8x8 block. So instead of the smooth gradient transition, you get step changes between the blocks - exactly what is happening with the Photoshop exercise above. That's pretty simplistic, and one thing it's not taking account is is the way colour gets handled in practical video systems. Sub sample the chroma, and an 8x8 chroma block in a 4:2:0 system will be twice the size in the picture of a 8x8 luminance block. In many implementations, the chroma is subjected to higher compression than luminance, so put those factors together and you may start to get an idea why banding is even more likely to be visible on saturated colour gradients?)

Practically, using 10 bit recording in a 1/3" camera like the HPX250 won't bring much improvement over a 8 bit system with the same overall compression level. Practically, the merit of P2/AVC-Intra in the HPX250 is to make it compatible as a B camera to use with other P2 cameras. It will be an improvement over AVC-HD recording (assuming the same camera front end) - but that will be primarily down to lower compression generally - not the 10 bit nature.

Josh Bass
March 14th, 2013, 02:33 PM
I've been looking into getting a cam lately and wanted to go Pana 'cause I remember how incredible the old DVX looked in even the most mundane situations.

I've been reading that there are issues with the 160(a), the ones you mentioned, which made me sad 'cause that was the one I was banking on getting.

I read somewhere the 160 and 250, though they same basically like the same thing codec/recording media aside, were actually developed by totally different groups and that the HPX250 is much more close related to the DVX feel/look 'cause of who worked on it.

I did the math though and an HPX with batteries and 2 hours of media is still about $7k. Thinking about the somewhat dated HPX170.

Tim Polster
March 14th, 2013, 04:56 PM
This close to NAB I would wait. The XF series is great and they might have an upgrade. The Panasonic cameras have a very nice image but I shyed away after reading a lot from owners. The 160's lens seems like a drawback as to what David mentioned. It is not a normal video lens. The auto focus has some odd behavior reports as well.

True, the AC-130/60 were made by the same group that made the AF-100 and the HPX-250 was from the broadcast division. I have also read reports of the HPX-250's lens going soft on the wide end at large aperatures.

For me, the price of P2, the lack of AVCHD on the HPX-250 as a choice (do not want to record everything at 100mbps & don't care for the intra 50mbps), the so-so lens servo motors of the Pansonic cameras and the negative lens reports led me to stay with the Canon XF300.

Maybe Panasonic will have an update as well.

Josh Bass
March 14th, 2013, 05:03 PM
Are the lens complaints the ones you just outlined? I'm not real concerned about autofocus, hardly ever use it so don't care how it performs.

Everyone says the AVCHD has its limits (grading, pixellates with motion), so I'd rather be safe than sorry. My client base runs the gamut from those who wouldn't know a lens from a doughnut, to those who have specific spec requirements, so having the high end format would be a plus. True, P2 is moronically expensive.

I am not anti-canon, however, considering what I've seen on sets around town working in professional video production, Canon seldom to never makes an appearance (same for JVC), at least in the small sensor world, the C100/300 are gaining traction, it looks like. With small sensors, it's always Sony or Panasonic. That's also been my experience with the out of towners I've dealt with. The safe bet would be, then, to integrate with these folks and appeal to them, to have a Sony or Pana (not interested in a large chip cam right now). And I've wanted to try a Pana for some time, since the DVX.

Guess we'll see what NAB has to offer.

David Heath
March 15th, 2013, 12:26 PM
I am not anti-canon, however, considering what I've seen on sets around town working in professional video production, Canon seldom to never makes an appearance (same for JVC), at least in the small sensor world, ......... With small sensors, it's always Sony or Panasonic. That's also been my experience with the out of towners I've dealt with.
Giving an opinion of the battlefield from one shell hole can always be risky, but certainly in the UK "always Sony or Panasonic, never Canon or JVC" is just not the case.

If you want evidence, the BBC bought a very large number of Canon XF305s a year or so ago, and have just announced a big order for JVC HM650s (500 units!) for self-shoot journalists cameras. ( http://www.dvinfo.net/forum/digital-video-industry-news/514856-bbc-orders-jvc-cameras.html ) In the wake of the first order, there's been a lot of interest in the XF305 from many others and you may be interested in a survey that was recently published for the most rented cameras from hire shops in the UK - http://www.dvinfo.net/forum/digital-video-industry-news/514181-top-rented-video-cameras-uk.html The glaring absence of manufacturer there is not Canon but Panasonic.

(Also see http://www.televisual.com/news-detail/Top-10-Rental-Cameras--The-Full-Report_nid-2525.html , and especially the end - "Planned Camera Investments for 2013". Looks like next year it's the Sony F5/55 that's really going to hit the headlines.)

OK, at the time the BBC bought all the XF305s, the main competition to the XF305 in the broadcast world was the Sony EX1/3, and the 35Mbs codec wasn't seen as fully acceptable for unrestricted broadcast. But with the PMW200, and it's fully approved XDCAM422, it's highly likely the BBC would have chosen that over the XF305 if they'd been making the purchase now.

Josh - earlier you said "'cause I remember how incredible the old DVX looked in even the most mundane situations." At that time, the "look" of a camera was largely determined by how it was set up at manufacture - and Panasonic had a "look" that tended to be liked for those in the film camp, the Sony "look" tended to be liked by those who preferred a "real" look, typically for news, sport, events etc. No right or wrong - personal preference, but I know what you're getting at.

But it's very different now. Pretty well all the cameras in the class today give a degree of control that was restricted to only the most expensive pro cameras in the DVXs day. Nowadays, the "look" of a camera can be whatever you want it to be, dependent on menu adjustments. True, there may still be a Sony or Panasonic "look" out of the box with default settings, but it wouldn't be difficult to adjust them so you'd swear the Panasonic camera had the "Sony look" and vice versa!

What I'm trying to say is don't buy a camera model because of a "look" - certainly not that of a model from over a decade ago! Buy one according to features, basic performance criteria etc - and tweak it to get the "look" that you prefer.

Personally, I'd say the PMW200 must be top dog in this market sector at the moment, largely due to the 1/2" chips and the "true" manual lens. And with the 50 and 35Mbs options (you can use SD cards with the latter), they are well suited to the media options, and the 50Mbs mode is as broadcast acceptable as AVC-Intra 100.

Josh Bass
March 15th, 2013, 04:13 PM
Those are good points. I think I'm still drawn to Panasonic for some reason. . .menu options, functionality, etc. One thing about the EX1 that really bugs me is it's the only cam I can think of that has audio knobs that work the opposite of everyone else (with any potentiometer I can think of, clockwise is "more/up" and counterclockwise is "less/down"--applies to volume knobs, dimmers, anything you can think of. Not that cam! Those knobs go the opposite way.). Can really throw you off when making on-the-fly adjustments. May seem petty and stupid but there it is.

Though to be fair I still hear the stuff I've stated above from other videographers/DPs. Sony's higher-priced large sensor stuff? Not gonna argue there. Their smaller chipped cams (EX line, etc.)? I've had colleagues bring their respective cams to sets just to a/b the looks and heard the same comments as I made above. Is that just how they look out of the box, and an EX can be tweaked to look "Panasonish" (TM- Josh Bass)? Maybe, but on the other hand I could never get the Pana look out of my XL2. One was just inherently different in some ways than the other. Handling of 24p even seemed different, aside from basic treatment of color and gamma/contrast. My instinct is, therefore, to get something that looks "right" either out of the box or with not too much tweaking (obviously in different shooting environments you'll have different setups - lowlight, flourescent, etc., that's not what I mean here, I mean the "root" look of the cam) vs having to pull your hair out to try get the look you want out of something that is not naturally going to look that way.

If we were talking about music/instruments here, it'd be like saying "you could possibly make a
Strat sound like a Les Paul, through a combination of FX pedals and amps, but why not just get the Les Paul?"

David Heath
March 15th, 2013, 05:13 PM
One thing about the EX1 that really bugs me is it's the only cam I can think of that has audio knobs that work the opposite of everyone else (with any potentiometer I can think of, clockwise is "more/up" and counterclockwise is "less/down"--applies to volume knobs, dimmers, anything you can think of. Not that cam! Those knobs go the opposite way.). Can really throw you off when making on-the-fly adjustments. May seem petty and stupid but there it is.
No, not petty and stupid - if something bugs you, it bugs you. But it's worth saying a bit more about it - the (very valid) reason is because the knobs are on the side, but are really intended to be operated from the back of the camera via a cutout. The idea is that you think about their operation from the rear of the camera - so "up" does mean "more" - very logical. But when looked at from the side, then yes, "more" does mean "counterclockwise" as you say.

But that's the EX1 - it's the PMW200 that I was talking about, and you'll be pleased to know that the audio knobs on that are purely on the side, and follow the normal convention for such - clockwise is "more/up" and counterclockwise is "less/down". So don't be put off!
.......on the other hand I could never get the Pana look out of my XL2. One was just inherently different in some ways than the other. Handling of 24p even seemed different, aside from basic treatment of color and gamma/contrast.
No, but the XL2 is likewise quite an old camera. Move to models currently on sale and it's a different story, a far greater range of control. Try to match something like a PMW200 and an XF305 and it's a very different story to a DVX100 and an XL2. You may find a simple menu control for something that on the XL2 or DVX100 was maybe only alterable with a screwdriver deep into the cameras electronics, if at all.
If we were talking about music/instruments here, it'd be like saying "you could possibly make a
Strat sound like a Les Paul, through a combination of FX pedals and amps, but why not just get the Les Paul?"
Not sure that's a fair comparison. In the case of musical instruments, isn't the sound largely a function of the physical hardware, intrinsic to the model? With cameras, so much of what makes up the "look" is how certain fundamental adjustments are made. Sony used to have a more saturated look, and a higher level of detail enhancement - Panasonic far less so. And those settings were effectively built in. Now it's just not the case. Load in one profile for one look, another profile for a different one.

OK, if the cameras were identical in other respects then you may well say that if the Panasonic gives me the look out of the box, why waste time buying a different make of camera and altering it? Firstly, it's likely that any of these will give you a choice of "look" anyway, so you're going to have some time on it. Secondly, they are largely NOT identical in other respects. Compare the PMW200 with an HPX250 and the 1/2" chips and true manual lens will give the former a huge advantage IMO, certainly more than enough to not make me worry about spending a little time in the PMW200s menus!

Josh Bass
March 15th, 2013, 05:21 PM
Fair enough, then.

I'm still gonna wait til at least NAB (if not much, much longer) to make a decision.

Price point is also something to consider, those higher end cams are nice, but practically I can't justify more than $4-5K including media (often a huge money-sucker depending on the type of card), batteries, bag, etc. (not much etc. 'cause I already have pretty much everything else I'd need), but still need something is as fully "professional" (eye roll, groan) feature-wise as it can be. That limits my choices right now.

Sam Lee
March 17th, 2013, 02:40 PM
You forgot to factor an increase in storage capacity and P2 offload time in the field. Without any proxy recorded on the HPX-250, it can roughly record 72 mins. With proxy added (HPX3100), you can get only about 68 mins. Of course you can shoot AVC-50 with reduced resolution. It's better to get AVCHD if file size needs to smaller and longer recording time on less expensive SDHC media. These file adds up big time in post if you have a month or more worth of content shot. Start getting 4 Tb SATA hdds and LTO-6 tape archival solution. You'll need all you can get your hands on. LTO-6 tape drive is roughly $2k. Each tape is roughly $100. Archiving on hdd is not recommended if it's sitting on the shelf w/ no powering to the hdd for over 2 years. Total cost for P2/AVC-I 100 is roughly 2-2.5x over regular AVCHD cam.

If you think AVC-I 100 is huge, try the new AVC Class 200.

Tim Polster
March 17th, 2013, 03:03 PM
I am sensitive to the different makers' "looks" and I think the guitar analogy is correct. We all have preferences. After using Varicams for a while and having a lot of control over the color settings, the 1/3" Panasonics without a color matrix just seem too limiting.

I have used the Canon XF300 along side the Varicam and they compare quite well in 720p60 mode. I much prefer the XF300 to the EX-1 that it replaced. (outside of sensitivity) At this stage in the game, color accuracy is very important to me. I want to be able to dial out the issues in-camera instead of post. I spent years dialing out red/megenta skin tones from the prosumer Panasonic cameras. Disappointing that the latest crop of Panasonic cameras still do not have a matrix.

I would contact a local rental shop and setup a time to pit all of these cameras against each other. Then you will know which one you like the best.

Josh Bass
March 17th, 2013, 03:46 PM
Vindicated!

Anyway, what's the word on these mini-P2 cards I hear are coming out? Recording time is important, but I'm more likely to shoot 2 hours of footage a day than 10. But I do every once in a while have one of those 8 hour lectern/presentation shoots.

David Heath
March 17th, 2013, 05:35 PM
Vindicated!
Well...... Tim does say "After using Varicams for a while and having a lot of control over the color settings, the 1/3" Panasonics without a color matrix just seem too limiting." So I could ask just what the "Panasonic look" is? Is it what a Varicam gives you, an HPX250 gives you, or what you originally referred to from a DVX100?

From the original posts, I took you to be referring to cameras in the DVX100/HPX250 class - and how they compared alongside other makes in the same class and from the same era. The real point is that when a DVX100 and such as a PD150 were compared all those years ago, the difference between the "Panasonic look" and the "Sony look" was night and day - no question, I'm in full agreement with you there. And the differences were not anything a user could do anything about. But I maintain that inevitable night and day difference is no longer the case, not with the degree of adjustment now available in this class of camera.

If you want to make a Panasonic camera look "real" (hence more suitable for news, sport etc) - you can do it. If you want to make a Sony look more "filmic", same thing - you can do it. (Reducing the default detail level is a good start.)

The absolute controllability of cameras in this class will not be equivalent to such as a Varicam or a PMW500 - but that's a different issue. We're talking about comparing £4,000 cameras with ones costing many times more, regardless of make.

Josh Bass
March 17th, 2013, 06:09 PM
I'm still under the impression that even with the tweakability, these cams still have root characteristics that can't be overcome, and that if one likes the skin tones on one cam/brand (for instance) one should probably go with that.

David Heath
March 17th, 2013, 06:29 PM
But what now are "the skin tones" on one cam/brand? When you now have so much adjustment? There may be slight root characteristics according to make/model but way overwhelmed by the differences that can be dialled in nowadays.

You could have one make/model and get ten different results with different settings that you may swear were from ten different cameras. Take another make/model (in the same price etc range) and get another ten results, do a blind test of the twenty and I'd put a pretty big bet nobody could tell which ten came from which camera.

Tim Polster
March 18th, 2013, 08:04 AM
In my experience, the prosumer cameras have more of a "look" than the more expensive models. When I say look I am referring to the colorimetry as well as a distinctive look of the images.

Sounds esoteric, but it is very much like the sound of a Les Paul Guitar vs a Strat vs a PRS. Sure all of these guitars can play Louie Louie and fit the bill, but they all have an individual sound if you can hear it. I have never met you David, but from your posts, I am sure you would be able to tell differences between camera manufacturers.

After working with the EX-1 for a few years I learned to move its image around to match it with Panasonic cameras like an HPX-500 & HMC-150. I never really liked/loved the image out of the camera. Something about it just looked plasticy or pastey. Anyway, this was a look I could not dial out of the EX-1.

I like the Panasonic look but their colorimetry has a lot of red/magenta in the skin tones which makes everybody look ruddy, especially in tungsten lighting. Without an extensive color matrix you are left to pull it out in post which trends the footage towards green...

The Canon comes very close to the look of a larger broadcast camera. I have found I do not need to "fix" very much in it's look, just enhance.

For the record, I have only demoed the 160 & 250 so I do not know if the cameras colorimetry is the same as the CCD era. It might be different with their CMOS chip.

Jonathan Levin
March 18th, 2013, 11:13 AM
Tim,

You are of course referring to pre-1959 Les Paul with PAF's and pre-60's strat right? ;-}

Jonathan

Tim Polster
March 18th, 2013, 12:38 PM
Ha, Yep, none of those mass produced modern ones.

David Heath
March 18th, 2013, 06:05 PM
After working with the EX-1 for a few years I learned to move its image around to match it with Panasonic cameras like an HPX-500 & HMC-150. I never really liked/loved the image out of the camera. Something about it just looked plasticy or pastey. Anyway, this was a look I could not dial out of the EX-1.
If I hear the words "plasticy or pastey" in connection with a camera my immediate thoughts go to what I know as "coring" - one of (IMO!) the worst ideas of camera processing ever to be dreamed up. (And I'm going right back to the days of tube broadcast cameras from the 1970's!)

It was (is) a form of processing to reduce camera noise levels, and it does it by suppressing detail enhancement when the edge boundaries are quite subtle. So for a sharp transition between (say) 0.2V and 0.7V, you get enhancement, for a transition between (say) 0.3V and 0.35V, you don't. Yes, it reduces noise levels - but means that whilst you get an outlining effect on high contrast edges, subtle detail isn't enhanced at all. Typically, in an extreme case, a face will look as though a line has been drawn round main features, but the skin is lacking in texture - "puddingy" is best description I've heard. Sound familiar? It was certainly a less attractive feature of cameras like the Z1, when it wasn't adjustable. Sony call the feature "crispening", and there's a paper about it at http://www.sony.co.uk/res/attachment/file/26/1166605183226.pdf . The diagrams at the bottom right are worth a thousand words

In tube cameras of the 1970's they needed all the help they could get to get the noise down, especially as they tended to be quite soft, and it was common to see detail levels cranked up to try to get back a "sharp" look. Rarely worked, and is exactly what gave "video look" it's worst name.

Now, it's different. At least with a full 1920x1080 camera detail enhancement is not what's needed, and if a camera is intrinsically sharp, it can be run with little if any enhancement without looking soft. That is good in several ways at the same time - even with a high coring level, the difference between the high and low contrast detail enhancement will be less, and less overall detail enhancement means less noise, so less need for coring - win, win.

If you get the chance, try turning the "crispening" level on an EX1 well down. The range is from -99 to +99 with a default "out of the box setting" of zero - and it's worth noting Alan Roberts recommends -45 in his BBC paper on the EX1. I'd also say to turn down the level of detail (Alan recommends -5, maybe less), for something approaching a more film look.

Josh Bass
March 18th, 2013, 08:09 PM
I haven't gotten to play with an HD panasonic extensively, on the rare occasions I've used 'em I either go with a "safe" menu setting or client has specific settings. . .that's too bad if they have a new look compared to CCD-era stuff. I always thought panas ran "bluer" than other cams, NOT ruddier.

Gary Nattrass
March 19th, 2013, 02:52 AM
I would agree that detail of -4 as per Alan's documents suits my HPX371 camera's, I would also say that I have never found any of the panasonic camera's I have used to be be red-er, they tend to be quite green biased if anything but it is all down to taste and I personally prefer the look as it is very filmic.

Josh Bass
March 19th, 2013, 04:19 AM
maybe i meant green instead of blue. that sounds more in line with what ive always heard about the Panas. ditto the "filmic"" look.

Gary Nattrass
March 19th, 2013, 05:18 AM
maybe i meant green instead of blue. that sounds more in line with what ive always heard about the Panas. ditto the "filmic"" look.

I think in comparison to Sony's they look green but there again Sony's now look too red to me so it's swings and roundabouts.

What I do like is all the BBC footage that is on most of their major nature programmes shot on panasonic camera's and all the drama work and outside shooting I have done on my HPX371 just looks really nice in 25p.

David Heath
March 20th, 2013, 07:41 PM
I like the Panasonic look but their colorimetry has a lot of red/magenta in the skin tones which makes everybody look ruddy, especially in tungsten lighting.
maybe i meant green instead of blue. that sounds more in line with what ive always heard about the Panas. ditto the "filmic"" look.
There sounds to be a little debate over even what "the Panasonic look" is.... :-)

One thing that's important to get right is that a simple "green look" is easily corrected for. It can be done in post, or such may be a very simple camera tweak. But colourimetry is far more than just a red/green/blue shift, it's the job of the matrix to take in the R,G,B signals from the chips and derive output signals by (hardly surprisingly!) matrixing. So the red output is derived from all of the red, green, blue chip signals - sometimes by taking negative values. In such a case, if cameras have two different matrices, then you'll never be able to match them precisely - compared to the original scene, camera A may make one colour look redder than camera B - whilst making another colour look greener.

But whilst these factors may be significant in high end cameras, it's much less so in the cameras we're talking about here. You may never be able to get a (say) HPX250 to precisely match a PMW200, but to someone who knows what they're doing, it's now possible to get them pretty close. An order of magnitude more so than was ever possible in the DVX100/PD150 days.
What I do like is all the BBC footage that is on most of their major nature programmes shot on panasonic camera's ........
I'm sure I heard a report recently which said that on the most recent NHU productions, the post was having to deal with something like 20 or 30 different shooting formats!?! Which ranged from Go-Pro and DSLR timelapse right through to Arri Alexa and Red. (I think nowadays the Panasonic cameras are in a minority, mainly for Varispeed effects? With the future seen very much as 4k for acquisition.)

So the point is that when you see their output, can you really instantly tell which camera has which "look"? I don't think I can. I was recently convinced something I was watching had been shot on a Red - but heard definitively it was an Alexa. Well, it looked very good anyway! :-)

Tim Polster
March 21st, 2013, 08:32 AM
It does go round and round to peoples' taste. To me, the Sony's skin tones have a pink tint. The Panasonics have a really nice skin tone after the red/magenta is pulled out. The Canon tends to favor red but has been corrected in the color matrix to be very true to real life.

I go for real world colors, true to the existing color. This is not a film approach but more of a live event approach. So it is not that important to everybody.

Sanjin Svajger
March 21st, 2013, 09:03 AM
My HPX171 definitely has an abundance of red in the image. One of the first things that I do when grading is removing the red. And it's not present only in the skin tones - it's present more or less in the whole picture.

@OP: another consideration I would personally make if buying a new 1/3 camera is it's gammas selection. The PMW200 has it's bigger brothers hyper-gammas. This is almost like a LOG gamma and is what's missing the most (at least for me) in the "all in one" handheld cameras. I read Alisters Chapmans blog about the PMW200 and I think he said that it has a little over 11 stops of DR . I don't know if this is when using hyper-gamma or a normal rec709 gamma. But anyway the hyper-gamma should give you a nicer highlight roll-of and highlight handling in general then all the other 1/3 cameras.
Though, I have just heard that the highlight on the HPX250 are very close to the varicams.
If I wasn't invested already in P2 gear and was in the market for a handheld I would almost certainly buy the PMW200.

Sanjin Svajger
March 21st, 2013, 09:15 AM
It was (is) a form of processing to reduce camera noise levels, and it does it by suppressing detail enhancement when the edge boundaries are quite subtle. So for a sharp transition between (say) 0.2V and 0.7V, you get enhancement, for a transition between (say) 0.3V and 0.35V, you don't. Yes, it reduces noise levels - but means that whilst you get an outlining effect on high contrast edges, subtle detail isn't enhanced at all. Typically, in an extreme case, a face will look as though a line has been drawn round main features, but the skin is lacking in texture - "puddingy" is best description I've heard. Sound familiar? It was certainly a less attractive feature of cameras like the Z1, when it wasn't adjustable. Sony call the feature "crispening", and there's a paper about it at http://www.sony.co.uk/res/attachment/file/26/1166605183226.pdf . The diagrams at the bottom right are worth a thousand words


Very nice David! I didn't know that crispening/coring can do that. What would you recommend for the HPX171?

David Heath
March 21st, 2013, 01:29 PM
Very nice David! I didn't know that crispening/coring can do that. What would you recommend for the HPX171?
Probably selling it and getting a PMW200...... (Sorry Sanjin, couldn't resist it.... :-) )

Seriously, I don't like crispening/coring (don't know what Panasonic call it), end of story. Hence I'd say wind it down very low. It's a very badly understood control, and tends to just be thought of a noise reducer. (Which it is - but the trade off is little understood.) Yes, winding it down will increase the noise, but it may mean you don't get the "puddingy" face effect (which I strongly suspect is what Tim was experiencing with his EX1) and can use less overall detail enhancement - which may put the overall noise level back to square one whilst giving a better balance between the subtle and high contrast detail. My feeling is that it's the lack of subtle detail, but outlining of high contrast edges that most screams "video!" - and that's most likely to be too much coring and too much detail.

But joking apart, that's far easier done with a "full HD" camera (1920x1080 chipset) than an HPX171. The latter has 960x540 chips, and nowadays, with bigger and "full HD" screens it needs all the help it can get to avoid just looking soft. I've seen an HVX200 directly compared to an EX1 on a good TV, and whilst the HVX200 didn't look too bad in isolation, it was night and day when compared directly. Wind the detail out and it just looked soft, wind it in and it started to look edgy - and noisy. You wanted to adjust it one way for one reason, but the other way for a different reason. Yet with a camera with a 1920x1080 chipset, there's so much resolution there in the first place, you can take the overall detail right down. That keeps the noise down, coring becomes unnecessary, so no "plastic" faces, and you end up with no edginess - but the picture not going soft.

Sanjin Svajger
March 21st, 2013, 02:13 PM
Yeah I know, I know:)
I think I wont sell it. It still has good use for web videos and press conferences where there's lot's of flashes going off (also for web).
As for the sharpening the HPX171 it's best to avoid coring, set the detail in camera off then remove noise in post and the sharpen.

To get back to the original topic. If I already had an AC160 all that I would do is buy a Ninja 2 and use that for times when a better codec is needed...