View Full Version : Teleconverters
Dale Guthormsen July 18th, 2006, 07:08 PM This is some footage of an economical 300 mm lens with the canon behind. It was real windy so there is movement even though it was on the heavy tripod.
For fun tomarrow I will film the same but with the 2x century on the front as well.
Graham Bernard July 19th, 2006, 12:12 AM For fun tomarrow I will film the same but with the 2x century on the front as well.
On the front of? XL2 or XM2?
Great footage today.
Grazie
Brendan Marnell July 19th, 2006, 04:34 AM This is some footage of an economical 300 mm lens with the canon behind.....
Attached Files 300+1.5.wmv (355.6 KB, 12 views)
.
By (355.6 KB, 12 views) do you mean that what we are seeing is your edited version/combination of 12 snippets of footage? What did you edit it with and How did you compress it so neatly?
And after compression how are you delivering your final package for such easy-viewing with WMP? I don't expect you've time to spell out the steps to me but a reference to the appropriate pages of some manual/guide/tutorial would be a great help, Dale, thank you.
Dale Guthormsen July 19th, 2006, 10:18 PM Brendan, Grazie,
What I actually ment was to put the 1.6 on the canon, then the adapter and the 300mm lens which then becomes 480 mm lens, multiply that times 7.4 for conversion to the ccd's, that makes it a 3552mm lens, then attach the 2x century on the end which will make it a reeiculous 7104 mm lens.
Well, it was rediculous as I thought it might be. the problem as I suspected was that you definitely lost the clearity that most anyone would want. If you were a double knott spy or something you could still make a persons face out but nothing like one would like to see for wildlife.
Anyway, it was an interesting test but that was about all.
The 300mm and the 2x century is alright bor bigger animals. You can make out the barbs on a birds feathers but they are not crisp.
As for adapters, I now am convinced that a higher grade adapter is a worthy investment.
I have a 100 to 500 zoom on the way and it will be of interest to use it.
Tomarrow I am going to start building a aluminum rail that will be adjustable for various lens. It is totally apparent that anything over the standard 20x lens is going to need it.
If you like i could attach a couple short clips of todays effort.
Graham Bernard July 20th, 2006, 11:42 PM Dale - thank you! I even needed to re-read this post and then the penny dropped! Thank you!
. .and yes, I would dearly love to see your efforts. Look, even below par stuff can give me a clue as to what I can/can't expect - yeah?
However, after reading your Sig: "Life is getting shorter!! " maybe you don't wish to - LOL! - you may have better things to do!
Brendan Marnell July 21st, 2006, 02:27 AM mutter mutter, mumble grumble ... Dale, I still want to learn (a) how you compressed the footage to a few hundred kbs and (b) how you posted this extremely neat link to allow us to see large scale footage images, blurs 'n all ... just answer, if you would be so kind:
1. It's easy; just look up thread XY or link XZ or help desk YZ OR
2. It's not easy; but there's a useful tutorial called XYZ to be got .. OR
3. You can't do it unless you have your own website to put it up on and that's where the link is sited ... for info ask website designer ...
... a reply of any (or a combination) of 1,2,3 would be much appreciated OR you may have a much better suggestion .. apart from shootin' myself with my XM2
Dale Guthormsen July 21st, 2006, 02:16 PM Brendan,
for the blur, I shoot in 1/30 if i have to but generally 1/60 with a polarizer, haze filter and both nd filters if light will let me. Oh yea, I always shoot in 16/9 and at 30 P. with the gl2 or the xl2
I have both premiere pro 1.5 and premiere elements 2.0. elements is a cool little program and exceptionally user friendly (dirt cheap too, and does not have the flaws of pennicle). I always use it for short work or something I am whipping up for friends or such that will not require a lot of Post work.
with elements: you go to export, select windows media, the default is 320 by 240 @30fps. It does the conversion, save and then attach as a file later.
wish I could say I was a wizard, NOT; but, at least I was wizard enough to buy such a handy little program to keep things simple.
I will post a few more short clips today or tomarrow, gotta take the wife out to supper and a flick this evening
Brendan Marnell July 21st, 2006, 03:06 PM Brendan,
for the blur, I shoot in 1/30 if i have to but generally 1/60 with a polarizer, haze filter and both nd filters if light will let me. Oh yea, I always shoot in 16/9 and at 30 P. with the gl2 or the xl2
I have both premiere pro 1.5 and premiere elements 2.0. elements is a cool little program and exceptionally user friendly (dirt cheap too, and does not have the flaws of pennicle). I always use it for short work or something I am whipping up for friends or such that will not require a lot of Post work.
with elements: you go to export, select windows media, the default is 320 by 240 @30fps. It does the conversion, save and then attach as a file later.
wish I could say I was a wizard, NOT; but, at least I was wizard enough to buy such a handy little program to keep things simple.
I will post a few more short clips today or tomarrow, gotta take the wife out to supper and a flick this evening
This is so helpful Dale ... it reads like exactly what I wanted to know. You go right ahead and kiss your wife during the ads; and just this once you can give her mine as well ...
Dale Guthormsen July 30th, 2006, 06:20 PM Here is the Test clip of the 100 to 500 mm zoom.
keep in mind that is the equivalent of a 760 mm to 3800 mm Zoom on a 35 mm camera.
The lens is not an expensive lens and as you reach out with it you can see a loss of clearity.
It was clear but hazey when shot. no filters 1/60th of a second at f22, opened up one f stop at 500mm.
To sumarize my test I will now step forward to purchase an ef adapter and a quality lens by next spring.
One thing is for certain, shooting over 300mm on the xl2 requires dead steadiness and overall is not all that practical.
whiile I spent a few hundred dollars on the lens and adapter I did not waste my money as I have a canon 35 mm camera that all the lens fit!!
for the most part the standard lens and a century or canon 1.7 plex will cover almost all of my bases.
Brendan Marnell July 31st, 2006, 03:19 AM What distance (approx) were you from the target, Dale? I'm presuming you took all shots from the same distance using a tripod.
Any idea why the colours seem to get richer when you move to 350mm?
Did you do all editing with Premiere Elements 2?
Dale Guthormsen July 31st, 2006, 09:57 PM Brendan,
I did all the post in elements, I only cut out the audio and put the title overlays on a seperate tracks.
I shot from approximately 75 feet, all from the same spot.
As you zoom in on an object the lens does not collect as much light. this requires opening up the aperature and the amount you open it will definitely make a difference in brightness. If i recall I left the aperature at f22 until I got to 500mm but perhaps I changed it at 350 taking it down two clicks which makes it f 16.
I focused best i could but to be honest I think I need a fu 1000 to get better focus on the longer reaches.
Oh yea, I have the camera on cine with technacolor presets and a little extra red.
Curiously, do you like the color as I have it set?
Brendan Marnell August 1st, 2006, 03:32 AM Until you posed the question "Do you like the colour as I have it set" I hadn't asked it of myself. That's partly because I'm trying to learn about videoing & post & putting stuff on view;
... as a longtime gardener I grow and enjoy & photograph a fair range of plants and flowers & I am automatically sceptical about the universal habit of "enhancement" when colours in nature appear in the media (It fits into the same slot in my tiny mind as "the worse the melody and harmony the louder we have to play the beat & shriek the words" + turn up the volume anyway to convince ourselves & the neighbours we mean it). In short I didn't expect to believe the colours so I didn't even notice them ... but now that you ask ... I find them all to be too warm, too saturated and therefore unreal ... I do realise that the alternative was to show them washed out as in nature where the foliage absorbs sunlight in ways our eyes (& our skins) can't cope ...
Dale Guthormsen August 1st, 2006, 04:42 PM Brendan,
The colors are slightly oversaturated as you mentioned. If you are looking on a computer monitor the colors are almost always brighter, more vivid and richer than when you see them on a large screen tv!!! I played it on my 54 inch and they look realistic.
when I make a dvd I color correct so it is as close to reality as possible. Things are very bright here in the prairies, this always means color correcting in post.
Brendan Marnell August 1st, 2006, 04:55 PM That makes good sense Dale, thank you.
I've just got Premiere Elements to send me an audio email (birdsong), now I must learn to send a video and then who knows I'll learn to follow your example and post a few snippets for snipers ...
Sam Mendolia June 10th, 2008, 01:12 PM My 2 cents.
Hello all, I'm new here, so forgive me for being late on this post.
I purchased a Raynox DCR1.85x Pro, a couple of years ago, for my Minolta still camera.
Works great on that unit, with a step up ring 49-52mm?
Slight vignette, and minor CA, depending on lighting.
I tried it this past weekend, on my Optura.
I had to zoom to just past the 50% mark, and the vignette was not visible in the viewfinder.
Zoom to full out, and depending on lighting conditions, CA was noticable, and the image was soft. Pulkl back, and the CA and softness were gone and the image was sharp.
Looking at in on the NLE system at work, and the images looked sharp, when I was not moving the camera, mounted on the monopod. Gotta use the tripod from now on.
The vignetting that was not there in the viewfinder, does creep in, on the NLE screen, so gotta watch for that.
The CA, again, depending on light and zoom range, is there.
Has anybody played with a ND filter or Polarizer, between the lens and Teleconverter, to try and minimize the CA?
That's my 2cents worth.
Hope to post more, as you have been a wealth of info, for me.
I now know where to go, to give me inspiration, and may get 14years worth of footage edited and critiqued.
I may even try my hand on a challenge.
Thanks.
Tom Hardwick June 10th, 2008, 01:28 PM Has anybody played with a ND filter or Polarizer, between the lens and Teleconverter, to try and minimize the CA?
Best not to put anything between your zoom's front element and the telephoto converter, as anything you place there will add to the vignetting and rob you of some sharpness.
Sony (PD170, VX2100) and Canon (XM2) used to put their OIS elements ahead of the zoom's front element, but they too have seen the light.
tom.
Sam Mendolia June 11th, 2008, 06:27 AM Thanks for the reply Tom.
I had thought about the extra vignetting, and my thinking led me down the lane of "thin" filters, to reduce the vignetting.
So the scenario would be, camera, filter, teleconverter.
I will test this out, and see how much sharpness I lose, and if I can can control some of the CA. I know that I will have to zoom farther, to get rid of the vignette, I have at present.
I'm just tinkering, for the sake of tinkering, when I can't get out and actually shoot.
This week will be a lot of tinkering, a lot of rain here this week, the weekend looks promising, so maybe my tinkering will pay off.
Dale Guthormsen June 12th, 2008, 07:37 PM sam,\
This is always interesting stuff!!
What would be the point of placing filters between the camera and duplex? Perhaps you just do not have the larger filters for the outer lens.
If this is the case, I have quite a few different sized lenses for both of my cameras, so I solved that problem by buying a conkin 3x3 filter holder and hood that adapts to lenses sized from 48 to like 86 mm. Any filters I purchase i get in 3x3 size and i can use them on anything. I believe it is the P system. It is also economical.
Look forward to your grabs/clips and comparisons.
Sam Mendolia June 17th, 2008, 06:12 PM Thanks for the input Dale.
Actually, the Raynox thread is larger than the Canon.
My thought was to find a way to reduce the CA, with some "other glass".
Yes, the "other glass" will produce it own degradation, in some form, probably a softer image, but that would be okay, as the "look" I'm after at the moment will be fine with that.
My nature videos will not look sharp, but then again, it is still dependant on what feel I am trying to acheive.
If I can not get the look I want, it does not get screwed onto the front of the camera lens.
This Raynox lens does not have a front thread, so we can forget about trying that.
I can build a mount for the front, of the Raynox, and screw it down, much like the GL2 lens hood, and then use filters there, and hopefully not introduce more vignetting.
I have a large collection of film filters, that could go in front of the lens(es), from my old still photo days. That would take alot of trial and error, that is why I 'm here, to learn from all of you, but... still make my own mistakes, and learn from them. Hands on, thats me.
I still haven't been able to test, as the kids, the wife, and the gardening between the rain, are taking up a lot of time. They aren't the best guinea pigs, they move to fast for me, when I'm trying to think. I am trying new things, that are new to me at least.
Right now the back garden is the small world I will be working in, so I can test, and re-test, much quicker. Then I can take it out on the road, and see how it handles.
As my wife says, I think too much.
But, when I'm done thinking, I get really good results, that I can repeat.
Keep you posted.
Sam Mendolia June 17th, 2008, 06:25 PM I will have to test this Raynox on my old Sony, that has a really small lens, and see what results I get.
The lcd should show me whether or not the CA is worse, and make Dale's point hit home.
But then again, I am stubborn, and will keep trying with the Canon as well.
Sam Mendolia June 21st, 2008, 07:46 PM Well I didn't test it on the Sony, but I did test it on the Canon again.
Finally got five minutes to my, on a day off work, and the weather cooperated.
Conditions were similar to my first use of the Raynox on the Canon.
I took of the UV filter, and screwed on the Raynox.
The image was sharp, and the chromatic abberation was almost non-existant.
Zooming in quickly, showed some CA, but once the image focused it was gone, right out to my max zoom.
I guess I will have to take off the UV filter whenever I plan to use the Raynox.
Next test is to try the circular Polarizer, just for those situations, that call for it, like when I'm out by the water filming fish and turtles, or images with glass reflections.
But as Dale said, why put something between the lens and the converter?
I'll have to find out of the Polarizer is one of those things that will be of use, without causing other unwanted issues.
For now though, no UV filter while using the teleconverter.
Haven't tried the wide angle converter yet.
But that will be another story....
Tom Hardwick June 22nd, 2008, 12:30 AM For now though, no UV filter while using the teleconverter.
Haven't tried the wide angle converter yet.
But that will be another story....
It's even more important to remove any filters when you use a wide-angle converter, primarily because of the very short focal lengths involved. Of course there may well be specific instances where your polarisor will be required, but do make tests first to chek for vignetting and flare.
tom.
Brendan Marnell June 22nd, 2008, 12:49 AM It's even more important to remove any filters when you use a wide-angle converter, primarily because of the very short focal lengths involved. Of course there may well be specific instances where your polarisor will be required, but do make tests first to chek for vignetting and flare.
tom.
Tom, please tell me: Is a camcorder (say XL2 + x 20 standard lens) made to perform at its best without any filter or polarizer? ... assuming that the visibility is good outdoors.
In other words, should the optimum be to take off filters if weather conditions are favourable and the glass is safe?
Tom Hardwick June 22nd, 2008, 01:20 AM A resounding yes to your question. If Canon or Sony or JVC thought that adding an extra element to the lens line-up would in any way improve the performance, it would be there. The 15 elements in your typical zoom lens all work in harmony and at the price give you the best on offer. Each extra piece of glass or plastic (many of the aspherical elements are high pressure injection mouldings) adds the risk of de-centering and certainly adds flare.
tom.
Brendan Marnell June 22nd, 2008, 02:55 AM A resounding yes to your question. If Canon or Sony or JVC thought that adding an extra element to the lens line-up would in any way improve the performance, it would be there. The 15 elements in your typical zoom lens all work in harmony and at the price give you the best on offer. Each extra piece of glass or plastic (many of the aspherical elements are high pressure injection mouldings) adds the risk of de-centering and certainly adds flare.
tom.
That is good news Tom, thank you. The more some accessory is discussed in isolation the more I fall into the trap of thinking that the accessory is more necessary/important than the basic equipment to which it may be attached. I should know in my late 60's that hype is the enemy of truth.
And apologies for a clumsy phrase in my question ".. should the optimum be ..." when I should have written " .. is it best ..."
Sam Mendolia June 23rd, 2008, 07:46 AM Thanks for the input on this issue.
I hope I wasn't wasting anyone's time, with this post.
As I keep reading, I look at my camera and say, how can I do that, or can I do what I do better, because of what I have read and seen, on this forum.
My equipment and I will be pushed to the limits, to get to the level I have seen here.
Hope to shoot more, edit soon and contribute, and get feedback.
Dale Guthormsen June 23rd, 2008, 02:11 PM Brendan,
Tom is correct about the integrity is best with no other lenses or filters. for that reason it is important to buy the very best filters you can afford!! I have always been suspecious of resin lenses just for that reason, though I have no evidence of them being any less quality.
Filters need only be used when you are trying to have a specific effect, otherwise you shouldn't place extra glass infron of your lens.
Most people doing outdoor vidography place a protective filter over their lens; however, if I am doing close up or macro work I always remove it.
Dale
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