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01/27/2006 06:39:09 PM · #1 |
Why does the Sigma 10-20, for example have a "for Canon" "for Nikon", etc...but say a Tokina 12-24 doesn't...just curious.
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01/27/2006 09:12:16 PM · #2 |
The Tokina lenses, like Sigma, Tamron and other third-party manufacturers, DO have variations "for Canon, for Nikon" and so on - they just might not make it quite so obvious on their websites and other marketing. Besides different mounts, some have different controls (e.g. some have an aperture ring on the lens, some don't).
My Tokina 20-35 is definitely for Minolta, not for other brand cameras. |
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01/27/2006 10:23:32 PM · #3 |
Thanks. I was actually just curious as to why the sigma 10-20, for example, is listed as three different lenses...and the Tokina 12-24 is only listed as one...
I guess what I was trying to say was that the Tokina lenses should be broken up as well...as to distinguish them from eachother.
EDIT: I feel I'm still being confused...this isn't a question in relation to the lenses themselves...it's a suggestion as to how they should be listed on this particular website, under Equipment, Lenses.
Message edited by author 2006-01-27 22:24:32.
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01/28/2006 03:03:55 AM · #4 |
Ahh, ok, I didn't realise you were talking about the listings here on DPC.
Looks like there's a few inconsistencies there (and maybe someone's changed something after your original post?). Some of the lenses are listed with no designation AND "for Canon" etc. - and a couple of them are listed with "for Sigma" variations, which is strange because I didn't think Sigma made cameras. Ideally, all the different "for " variations should be rolled up into one, I'm not convinced there could be significant optical differences between a Sigma for Nikon to a Sigma for Minolta.
Even stranger, some of the lenses have (Silver) variations listed separately. If the body colour really affects the quality of the optics, why would anyone spend thousands of dollars on the expensive lenses when you could just buy a cheapie and paint the body white? :)
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01/28/2006 03:13:45 AM · #5 |
Originally posted by paddles:
Even stranger, some of the lenses have (Silver) variations listed separately. If the body colour really affects the quality of the optics, why would anyone spend thousands of dollars on the expensive lenses when you could just buy a cheapie and paint the body white? :) |
Large optical systems are notoriously sensitive to variations in heat. The 200-inch Hale Reflector on Mt. Palomar is housed in an uninsulated dome so that when it is opened to the night sky it will not change temperature and begin to distort. The astronomers, back in the day when they actually rode in a cage high up in the dome and observed optically, had to bundle up for extreme cold.
In theory, you can get more consistent performance from large telephoto lenses by making them heat-reflective (light-colored) rather than heat-absorptive (black). This may even be practically true with the really big guns, but I suspect Canon's use of the "white" lens for its L-glass zooms like the 70-200 is more of a marketing ploy than a practical one.
Even so, to answer your (probably facetious) question, you start with good optics (hopefully) and it will never get any better than that. So you couldn't make bad glass into better glass by chroming the barrel...
R. |
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01/28/2006 09:02:24 AM · #6 |
Originally posted by paddles:
...and a couple of them are listed with "for Sigma" variations, which is strange because I didn't think Sigma made cameras. |
//www.sigma-imaging-uk.com/cameras/index.htm
and B&H has some film bodies listed from sigma too. The SD10 is rather dated, but uses a foveon chip for it's sensor - it works differently than all other CCD/CMOS sensors. //www.dpreview.com/news/0202/02021103foveonx3preview.asp
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