Question
As the Sigma 85mm f/1.4 EX DG HSM was originally designed for Full-frame cameras, how would the performance be affected if I use it on Canon 60D (APS-C camera).
Q1) I need confirmation that this lens can be used on Canon 60D ?
Q2) In the Sigma official statements "When used on digital cameras with an APS-C size image sensor, the lens effectively becomes a 127.5mm F1.4 lens"
Can some kind soul here please explain to me in simple layman terms what does that mean?
ie instead of telling people that i have a 85MM Lens, now, I have a 127.5mm lens - can i tell people that i have a 127.5mm lens?
Q3) Will the perforamance of this lens suffer / be worse off since i am using a APS-C camera instead of a Full Frame Camera in which this lens was designed for?
Q4) Note! If the camera body does not support HSM, autofocus will not be available. Does Canon 60D have this function?
I am sorry that I have asked many questions but I do hope someone can please explain to me.
Answer
I have the Sigma 85mm lens and I am using it on a Canon APS-C sensor camera, the Canon 30D.
Q1 - Does it work? Oh Yeah! I have been so impressed with the performance, I consider it the best lens I own right now.
Q2 - If you put this lens on a "full frame" camera, you get the normal 85mm photo. If you put it on your 60D, you get what appears to be a larger picture. It is a picture that is equivalent to one that you would get if you put a 135mm (there is no 136mm lens which is the actually length) lens on a full frame camera (not your 60D). The way this is figured is to multiply the focal length of the lens times 1.6 (the crop factor). So 85 x 1.6 = 136 (not 127.5 - that length is correct for Nikon APS-C cameras)
Q3 - No suffering will take place.. the photos are simply amazing!
Q4 - The HSM is the same as USM on a Canon lens, and it works just fine on a Canon 60D
Here is a web site that I created because I love this lens so much.. www.sigma85mm.com
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