View Full Version : Should one have the Image Stabilization "ON" when using a steadycam?


DIGIXLDV
May 20th, 2002, 10:33 PM
Greetings Folks!

Should the IS be ON or OFF during filming with a steadycam type of gear?
I ask because I will sure get the manual lens with the XL1S.But I'm trying to find a reason to get the standard lens as well instead of getting the body only + the manual lens. What other times could I need the standard lens?I don't do weddings.The camera will be used for independent filmmaking.

Thanks a lot!

Adam

Adrian Douglas
May 20th, 2002, 11:17 PM
Using the IS with a steady cam would produce the same effect as using it when tripod mounted. The IS is designed to compensate for small shakes not large movements. You'd get the same lag as you do when you pan on a tripod with the IS on.

Rob Lohman
May 21st, 2002, 04:53 AM
So your saying it should be off, right Adrian?

DIGIXLDV
May 23rd, 2002, 06:18 PM
Thanks for the help folks!

Cheers,

Adam

Charles Papert
May 23rd, 2002, 10:43 PM
I have heard recommendations that the IS should be switched off when using a Steadicam or similar stabilizer. My experience in the past with the Steadicam JR is that occasionally there may be a slight vibration that can pass through the system, and the IS will actually help with that sort of high frequency isolation. Also, if you haven't gotten the hang of the system and your pans are a tad jerky at the starts and stops, it may help to smooth those. However it will also give you a sort of disconnected feeling since there is a slight delay in the response of the electronics, particularly at telephoto settings, which may be confusing if you are trying to compensate for that with the Steadicam. It's a matter of personal preference and worth experimenting with.

I do however feel that the IS can be an excellent tool for handheld work, allowing far greater focal lengths to be achieved while minimizing shake (if this is desired). This may be desirable for your filmmaking as an option. To me, nothing beats the responsiveness of the manual lens, but I would be inclined to have both if you can possibly afford it. If this is the case, you may want to look at the older 14x manual lens instead of the 16x manual, as the 14x is substantially cheaper. You lose some telephoto capability, but you would have this if needed at on the standard lens, as is also the case with motorized zooming which is also not found on the 14x but available on the 16x "manual". In other words, the difference between the 14x and the 16x can be made up for with the standard lens.

Ken Tanaka
May 23rd, 2002, 11:20 PM
Charles,
In that (very informative) note, are you also saying that using IS with a Steadicam-type rig represents a barf-hazard? <g>

Adrian Douglas
May 24th, 2002, 10:52 PM
I'd leave the IS off if I was using a 'Steadicam' type device. Just like I do when I use a tripod. However, I agree with Charles in the fact that's it's personal preference.

Charles Papert
May 26th, 2002, 07:54 AM
Ken, I think that the effects of the IS on a Steadicam type stabilizer are too subtle to be classified as barf-able. The most one would experience as I suggested is a slight wandering in the frame, depending of course on how good the IS involved is (I have found that the Canons and Sony are very very good, and the type that blow up the image slightly and stabilize that are not as good). In actuality, I think that unless the individual using a stabilizer has bothered to spend some time learning and practicing, the floaty operating will have more of a "barfy" effect than anything the IS can cook up!

So anyway--to recap, I happen to use the IS as I think it smooths out the tiny jitters that can translate through a stabilizer, but most people seem to prefer to turn it off.

James Emory
August 5th, 2002, 01:54 AM
Hello. I operate a body rig quite a bit with the XL. The first day that I used it, I used the standard 16:1 without the built in stabilizer enabled and noticed very small vibrations picked up from the stage of the rig. Next I enabled the XL's stabilizer and noticed what was mentioned in an above post, but only after reviewing the footage on tape, when it's too late. The image floated or drifted just as stated in the earlier post like it does if enabled while on a tripod. Finally, because of using the 16:1, it seemed as though visually it looked like you were never going to get to your destination because of the length of that lens's perspective. So, I put the Canon 3:1 wide on and that did it! The small vibrations were gone from the image and space just seemed to FLY by now, exaggerating the speed, with the 3:1 installed. It really made that much difference. I guess the easiest way to say it is that the much wider perspective with the 3:1 diminished the 16:1's narrower field of view cutting down on typical long shot vibration magnification or exaggeration. If the 16:1 must be used, I would not recommend enabling the stabilizer because it is counter acting the rig's purpose and is evident in the footage. If anyone reading this has not tried a wider lens when using body or isolation rigs, that could make a big difference in the final product. Click on the links below to see demo footage of the XL flying in production. This is best viewed with a high speed connection.

Links:

(high speed)
http://198.65.158.133/steadicam/STEADICAM300K.asx

(dial up)
http://198.65.158.133/steadicam/STEADICAM56K.asx

Josh Bass
August 5th, 2002, 03:41 PM
When you guys talk about the effects of leaving the IS on while doing a tripod movement, I'm not sure I know what you're talking about. The thing I've noticed is that while doing pans with IS, everything seems to vibrate--if you fix your eye on one point on the image (say a tree) as it moves across the screen, it seems to vibrate slightly as it moves. . .maybe this is just a video thing though.

Ken Tanaka
August 5th, 2002, 04:06 PM
By nature, the wider 3x lens will be a stabler shot than the 16x. Many shooters treat the 3x as their standard lens mainly for that reason, and only use the 16x when they need a tighter or longer shot. I really like my 3x for crowded indoor situations. It's interesting to see that the 3x helped to quiet down the residual Steadicam motion.

James Emory
August 5th, 2002, 07:03 PM
Howdy Ken. I am one of those shooters that you described. At first I was hesitant to use it much because of the short zoom on that lens and didn't want to be trapped with it if I needed a long shot in a hurry. But after using it for interviews and just close quarter hand held, it now stays on the camera. I even prefer it when flying it on the jib. It makes any space look so much bigger than it really is. One of the best features of this lens is that it has very little distortion for such a short lens. I couldn't work without it!

Charles Papert
August 5th, 2002, 10:02 PM
James, nice work in your furniture store piece. You made some good and interesting choices going around corners, panning before your body made the turn which makes for more intereresting viewing. In long low ceiling rooms like that, it's a bit challenging to work with such a wide angle in the 4:3 aspect ratio, it really lends itself to a widescreen frame. Next time you are in that environment, you may want to play around with tilting down to avoid the ceiling a bit--you may even find that it exaggerates the perceived speed of the move, since you will be introducing more foreground floor and objects will stay in frame longer (with the wide angle, moving past foreground objects tends to make the shot look zippier! Reference the hedge maze in "The Shining"--those tall hedges flying by on the edge of frame really add to the effect).

Most impressive though is that you have overcome the bounciness that can show up in that level of stabilizer, due to the limited design of the arm (aka the pogo effect). The shots look nice and smooth. Again, good job!

John Locke
August 5th, 2002, 11:38 PM
James,

I also wanted to say what a nice job that is. Makes me realize how boring most furniture commercials have been that I've seen, basically slide shows of static images. The "flying" viewpoint just keeps you glued to the monitor.

I also agree with Charles...I think less ceiling would be better. In fact, I'd lower the overall height some (so as not to cut off the lower portions of the furniture so much) and then still preserve the downward angle to cut the ceiling. Getting closer to the floor would also increase the perceived speed.

I shopped around earlier this year for a Steadicam or Glidecam but then put that purchase on the back burner due to the cost. But after seeing this footage, I've got the itch again. Dang.

Charles Papert
August 6th, 2002, 07:39 AM
mmm...well...booming down would have reduced the depth of the room somewhat, blocking the furniture at the back. But I agree about the increased speed at a low angle (OK, another movie reference: the end credits of "After Hours", the Scorcese comedy from the 80's, which feature a lengthy low mode Steadicam shot hurtling around an office. Worth checking out if it shows up on cable some night).

Chris Hurd
August 6th, 2002, 08:07 AM
"After Hours" is about the only acting job by Griffin Dunne that I've ever really liked, aside from "American Werewolf in London." Well worth seeing. One of those everything that can go wrong, does go wrong type of movies... from the $20 bill flying out the cab window, it's all downhill from there... the night from hell. Check it out. Oh yeah, cool Steadicam shots too. Off-topic, sorry...

James Emory
August 6th, 2002, 05:31 PM
Thank you very much for the nice compliments! I totally agree with the head room comments. That 3:1 is a tricky b_ _ _ _ _d, but is necessary. With it's incredible wide field of view, even with the camera and stage on the rig looking level, I guess I undercompensate for it. I mean if you tilt the camera down to compensate reducing headroom, in your mind you're thinking that ain't gonna work, but it's the lens that your compensating for and that's what I'm gonna have to work on. It's happened in a couple of other shoots too and I said to myself, surely I wasn't tilted up that much. It's just gonna take more time in the vest! The reason there is not any bobbing is because of the ability to find a level float with the spring adjuster. If a small amount of downward pressure is applied to the arm at the post, it really helps dampen any unwanted vertical motion. Also, I have now added the MA-200 for additional weight and now it flies even smoother. It is a paradox. The idea of lighter gear is not the complete answer. A certain amount of weight will always be necessary for these isolated body rigs to work. At least for the spring loaded arms anyway. A friend of mine has the real machine. His arm has the ability to stay where you put it vertically. When you raise it 5 inches it stays there! With my level of rig, it always returns to a centered float after a veritical rise or fall. The spring really assists with the weight though when performing a vertical rise. He also payed $70,000.00 or his. Have mercy!

John Locke
August 6th, 2002, 09:21 PM
Oops! Should have used IMHO, I guess.

What I was visualizing was the closing credits of "Grand Canyon." There are moments when the chopper flies above the canyon and takes in the whole panorama, but then it also dips down and flies through the narrow passages. The panoramic shots are slow-flowing and beautiful and establish the location, while the passes through the narrow passages are more exciting and more detailed.

In looking at the furniture showroom, it seemed to me that staying up at eye-level the whole time shows all and nothing. You do see the whole room, but you don't really see a lot of detail in the furniture aside from those closest to the camera...and those closest to the camera you don't see all of since you're seeing them from a high viewpoint.

So...just thought it would look cool for the camera to truly appear to fly through the showroom...changing altitude from time to time...not only to focus on premiere items...but also for a more thrilling ride through couch canyons and armoire arroyos.

IMHO ;)

Charles Papert
August 6th, 2002, 09:51 PM
Yes James, it is true about the paradox of Steadicam, the heavier the system the better it flies. In many ways it is much easier to make good shots with a Panaflex on a full-size rig than an XL1 on a Steadicam Mini or Glidecam--the more inertia involved, the more stable the system. You just have to get used to humping around the 70 lbs vs the 20 lbs! That said, I wouldn't have wanted to fly my rig around that furniture store, you covered some serious ground there!

That's interesting that you are achieving good results by overcranking the arm slightly and applying pressure. In the past the thinking was that undercranking the arm and lifting it up to the neutral point would be smoother.

It is certainly strange to tilt down as much as it appears when working with a wide lens and minimizing ceiling! One tip I can offer (which you may well be familiar with) is to preset your tilt angle by adjusting the fore and aft on the top stage so that the rig takes a natural downhill bias. This way you can avoid having to apply constant pressure on the post to maintain the desired tilt. Great way to deal with stairs or looking down from balconies. If a shot requires a lengthy section of tilting down substantially but also a good run of level stuff, it sometimes helps to slide the gimbal down a tiny bit i.e. make the rig less bottom heavy, closer to neutral. This again helps to minimize the amount of force to hold a tilt. The tradeoff is less feedback from the rig to help you find level; a subtler touch is required also.

John, of course it was IYHO, no worries mate. It's always a matter of individual taste. Unfortunately the maximum boom range of any production Steadicam is about 3 feet total, and only half that on a single-section arm rig such as most of the DV setups. Doesn't make for super-dramatic booming possibilities like diving into ravines! Although you can make it appear to do so just by flying close to things. And there's always the low-mode option, if you have the gear to suspend the camera, which will allow flying over settees and coffee tables with wild abandon! (If you lack the accessories to undersling the camera, most rigs will allow you to simply flip the whole thing upside down and rebalance. Then you just re-invert the image in the edit.)

This, as my head hits the keyboard after a full day of flying the rig--luckily not the whole 70 lb enchilada, only a relatively featherweight Super 16 setup coming in at around 58 lbs...! And it wasn't ten times around a furniture showroom but we still covered a fair amount of ground--take after take--g'night!

John Locke
August 6th, 2002, 10:09 PM
Makes me wonder how the Marzpak would perform in comparison. Then you could have the latitudinal changes as well as the flexibility to "fly over" items. You wouldn't get the super smooth stretches...but then again you would get some interesting new angles.

James Emory
August 6th, 2002, 11:06 PM
Oh Charles, did you have to go and say it? I like that idea of total inversion and flipping the image in post though. If it wasn't for the render time, that might be practical. Anyway, I have the typical low mode kit that mounts on the stage with a lightweight "C" cage for mounting the package. This is more involved to balance than the standard set up, at least for this system anyway. I have yet to use it.

Charles Papert
August 6th, 2002, 11:18 PM
So much for going to bed early...!

James, spend a rainy day checking out low-mode. It's not really much more complicated to balance, and the results can be really spectacular. As a big fan of the 3x lens, I think you'll be blown away by the dynamic of the low angle.

It's also a good idea to get "fluent" at both setting up and operating in low-mode for that job that might suddenly come up; also you will be more likely to offer it up once you are comfortable with it.

On the flip side, it's always more awkward to operate and more tiring (something to do with the mass being lower on the body). Not as relevant with a lightweight system, but it may well be noticeable.

Let us know how it goes!