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FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
Thread started 04 Mar 2011 (Friday) 18:55
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Canon FD lenses + FD-EOS Adapters, crop factor?

 
tsong
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Mar 04, 2011 18:55 |  #1

I'm just wondering, I haven't really looked into it. I have a Canon FD 28mm f/2.8 from my old AE-1 Program and a Sigma FD 35-70mm f/2.8 also. I bought a Zykkor FD-EOS Adapter from eBay for $30 last year so I could use them, but I haven't really thought about the crop factor until now.

I have a 40D, so I know with an EF lens it's x1.6, but what about with the FD lenses+Adapter?




  
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xarqi
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Mar 04, 2011 20:46 |  #2

Crop factor is an attribute of the camera body, not the lens.

If the adaptor you bought contains optical elements, it may be acting as a teleconverter. In that case, the focal length of the lens/adaptor combination will be different from the lens alone. The TC factor should be in the documentation for your adaptor, if indeed it is acting as a TC.




  
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arentol
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Mar 04, 2011 22:00 |  #3

The FD-EOS converters typically act as 1.25x Tele-converters. So your focal length for a 28mm would become 35mm. 35-70 would become a 44-88mm.

Crop factor is then applied on top of those numbers.

28 = 44mm equivalent
35 = 70mm equivalent
70 = 140mm equivalent


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Canon FD lenses + FD-EOS Adapters, crop factor?
FORUMS Canon Cameras, Lenses & Accessories Canon EF and EF-S Lenses 
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