Here is my answer to this member's question:
A: Dear eBay Member,
Thank you very much for contacting me with your question. This is a very important subject to me too because I own a Canon A-1 camera and many wonderful Canon FD type lenses.
Unfortunately, I have found no practical way to use these lenses on an EOS camera. I have tried all of the FD/EF "adapters" that I have seen, but none of them are completely acceptable to me. Many attempts have been made and I will continue to watch for a "workable" solution.
The back element on a FD lens is not the right distance from the imaging plane to work properly on EOS bodies. Adapters try to compensate for this, but in my opinion, not very successfully. Also, the aperture actuator is "mechanical" (a small lever) on FD lenses where all EF lenses have an "electro-mechanical" aperture, which is totally incompatible. Lastly, all FD lenses require manual focusing.
I wish that I could use some of my very fine (and quite expensive) FD lenses on my EOS cameras too. Regrettably, this is just not practical. I keep both types of Canon cameras completely separate and I have had to duplicate all of my lenses and accessories. I wish there was a good solution to this, but I have never found one, and I have really tried just about everything.
However, I will continue to watch to see if anyone produces an adapter that will work in a way that I find functional and acceptable.
Introduction To The Q & A Guide Series:
I have been answering potential bidder's questions about the items that I have listed on eBay for several years. One kind person suggested that there may be other members who have wondered about the same subject, but may have been too shy to contact me directly. He suggested that it could be useful to post his question, and my answer, for others to see. He recommended that it could be done in the form of an eBay Guide.
This is the fourth in a series of Q & A "Guides" that will be posted.
This series of eBay Guides is based on real questions that were asked of me through eBay Messages, using the "Ask The Seller A Question" feature on my listings. Hopefully, these Guides, based on my actual responses, might provide useful answers to some of your questions too.
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