During the time I was using EOS 5 film camera, I purchased a 2nd-hand Sigma 400mm-f/5.6 APO lens. As expected, this lens is not compatible with current digital cameras. I have tried it on manual focus with my 5D/MK IV and founnd that it does not work on any settings. Sigma Technical Suppot stated that the lens is too old for retrofitting it. Is there a gimmick that could make this lens work, even in totally manual mode?
Vasilis, Greece
Vasilis, Greece
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