danski0224 Offline Upload & Sell: Off
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The only "good" FD to EF adapter is OEM Canon, and it is uber rare and uber expensive.
If the 3rd party adapter has a glass element, quality will likely suffer. If it doesn't have a glass element, infinity focus is lost.
Ed Mika made (makes?) many mount conversion kits for FD to EF that (mostly) retain infinity focus. These kits replace the FD mount, usually in a non-destructive and reversible way. However, switching back and forth isn't practical. He had a store on that big auction site. I haven't looked for a while as the economics of buying and converting FD glass didn't work out for me.
Given the rise in cost of FD lenses, I wonder what the attraction is in buying them to convert if you do not already have some of them. Nikon AI-S lenses are readily available, there are a few really good ones, even by current standards, and work just fine on a Canon camera with an inexpensive adapter
Probably a good idea to thoroughly check reviews of EF-M to FD adapters. There is likely to be a wide range of quality and I wouldn't be surprised to learn that two or three manufacturers are rebranding all of what is available.
I would look into Ed Mika kits, if available anymore, for your lenses and then you can use the EF-M to EF adapter from Canon.
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