I have a very old 400mm Apochromatic (prime) Sigma lens that I used with my EOS 5 (film) camera. It is, by no means, compatible with a DSLR neither can it be retrofitted by the Sigma service facility. I thought that it could be used on a DSLR on manual mode and on the MF mode of the lens. If it could I could use it or give it away to other people to be used on manual all the way. However, it did not work on my EOS 5D MKII and I got a message "Error 1" which means no communication between camera and lens. I was surprised to see that, as I know that by reversing a lens, in which case no electrical communication exists between camera and lens, you can make macro photos. This implies that communication is not necessary in an "all manual" mode. Is there an explanation?
I would hate to discard the lens or place on my mantelpiece!
I would hate to discard the lens or place on my mantelpiece!
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