|
I also noticed that radial CA correction seemed to work very well on this image.
Does anybody know if there is software that performs CA correction on video? I've seen some packages that do this on still images. It wouldn't be hard to do the same for video, but I haven't found anything that does it... Bill |
Huzzah for internet film school!
Forgive me for digressing from the topic at hand. Also forgive me for being a dyslexic, unlearned, dumb ass. I have a couple questions.
1. What does the 'x' in 0.6x, 1.6x, etc.. on telephoto lenses represent? 2. Am I correct in my understanding that the longer the focal length of my lens, the narrower my depth of field becomes? |
Joe: the x represents the multiplication symbol. So, the Z1's published lens spec (in 35mm still camera equivalence) is 390mm at full zoom. Adding the 1.6x teleconvertor gives us a 35mm equivalent of 390 x 1.6 = 624mm. In other words, the teleconvertor multiplies the camera's built-in lens 1.6 times. Yes, your understanding of narrow depth of field is correct.
William: interesting point. I'm not aware of any software but maybe someone else is. |
Boyd, thanks for breaking that down for me. All this is starting to make sense now.
Is there a 1.6x teleconverter you'd recommend that is between the $300-$500 range for the Z1 or should I just cut down on my drinking for a week and get the Century? |
The century is the only one I've used, but the following thread might be of interest: http://www.dvinfo.net/conf/showthread.php?t=51686
|
Boyd,
Thankyou for the info re the lens hood. I did a quick check round over this side of the pond about the offer you got. Nobody had heard of it. A quick e-mail to century in the States put me in touch with the Uk imports, who match the deal. I am now the the owner of the said hood having collected from them at the Video Forum show being held here in London at the moment. regards Mick. |
Very cool Mick. See, it pays to be a DVinfo member :-)
Are you using the hood with one of the Century lenses? Or have you found a way to put it on the stock lens? I guess you could do that if you got one of their bayonet mounts without a lens, but that might be expensive. |
Quote:
I'm useing it with with the 1.6. Could have done with it a couple of weeks ago when filming cheetahs in the Masai Mara when it suddenly rained, it would have helped to keep the rain off as it was falling almost straight down. Still we located them the following day and got some good footage. |
Quote:
joel oh yeah i use them together aswell.... 1.4x+1.6x=3.0x!!!!!!!!!!! times 12x (STOCK ZOOM) = 36x!!!!!!!!!!!!!!!!! think i am crazy? i post some pics so you can compare the century... joel |
Lens Shade
Hi Boyd
An addendum to my earlier e-mail to you (feel free to post it): A polarizing 4 x 4 filter only sort of works in the lens shade for the Century W/A lens. You really need a fully rotating holder that you get on a matte box to get the full force and effect of the polarizer. But, the filters and the holders are beautiful, but expensive, about $150 a pop for the holder and or the filters. Jack Hubbard |
Hi Joel,
Are you using the Canon C-8s with Z1/FX1 with John Jay's recipe? I've been considering this but want to hear some positive feedback as well as stills before making my final decision. If you would email me (joe [-at-] lumbroso.com) some stills, I could host them for this forum. Thanks. |
Quote:
Otherwise, B&H could sell you 5 nice 1.0x "teleconverters" to get 1.0x+1.0x+1.0x+1.0x+1.0x = 5x. http://www.bhphotovideo.com/bnh/cont...goryNavigation :) Cheers, Bill |
Quote:
http://www.clamcamvideo.com/images/STD.jpg http://www.clamcamvideo.com/images/STD.jpg My close examination of the images says there's just about as much chromatic aberration with out the telephoto converter installed as there is with it. It's magnified by the teleconverter but I don't believe the converter adds much. My observation is that the Century converter is not the CA culprit with the Z1U. Carroll Lam |
Carroll, I have to agree with you. If you look at my frame grab taken with the builtin lens at full zoom you'll also see CA. I think the Century 1.6x has simply magnified it, like you say.
|
You'd think Carl Zeiss could do better. 8-)
Carroll Lam |
| All times are GMT -6. The time now is 08:46 PM. |
DV Info Net -- Real Names, Real People, Real Info!
1998-2024 The Digital Video Information Network