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Old Oct 5, 2004, 2:45 PM   #1
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Hi,

i presently own a sigma ex 105mm f2.8 Macro, a sigma ex 70-200mm f2.8 APO and a Sigma 2x converter, all for the Canon Eos/AF range.

I am contemplating switching to a digital camera (still in the Canon Eos system) and am wondering whether the above lenses would work.

any advice would be welcome.

thanks

:?


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Old Oct 5, 2004, 3:39 PM   #2
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Mr Lewknor wrote:
Quote:
Hi,

i presently own a sigma ex 105mm f2.8 Macro, a sigma ex 70-200mm f2.8 APO and a Sigma 2x converter, all for the Canon Eos/AF range.

I am contemplating switching to a digital camera (still in the Canon Eos system) and am wondering whether the above lenses would work.
Chances are, they'll work fine. However, it's possible that they may need to be rechipped for newer cameras, depending on their age. Some of the Canon DSLR users will probably be able to answer your questions.

Keep in mind that most DSLR models have sensors that are smaller than 35mm film. As a result, the entire image circle isn't used. So, you have to multiply the focal length of the lens by a crop factor to determine the 35mm equivalent focal length when used on most Digital Camera. For a model like the EOS-20D, this crop factor is 1.6. So, your 105mm lens would have a 35mm equivalent focal length of approximately 168mm on it (105 x 1.6 = 168 ); and your 70-200mm lens would have a 35mm equivalent focal length of approximately 112-320mm.

Only a handful of DSLR models do not have a crop factor (the two in the Canon lineup are the EOS-1Ds and EOS-1Ds Mark II). Kodak also has a few "full frame" models (Kodak DCS 14n, DCS SLR/C and DCS SLR/N)

I'll move this post down to the Canon Lenses Forum for you. Chances are, you'll get more knowledgable responses there.
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Old Oct 5, 2004, 4:51 PM   #3
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Many thanks.

Ahh for the good old days when all i needed was a cardboard box and a pin...
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Old Oct 5, 2004, 4:55 PM   #4
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I have the Sigma 70-200mm f2.8 EX APO and the Sigma 2x converter. Here a shot with that combination on the 10D:






As to the Sigma EX 105mm f/2.8 on the 300D/DRebel:
http://www.stevesforums.com/forums/v...m_id=11&page=1

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