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p.1 #8 · New MD MC SR lens to EOS body adaptor | |
I don't think you quite understand. Attaining infinity focus doesn't really have anything to do with mirror issues, other than just obstructing the mirror. By making the adapter thicker, you reduce the focus distance, and at that thickness I'm sure you would lose infinity focus. This means that even with the lens focused on the infinity mark on the distance scale, the actual focus distance would be closer than infinity. This effect becomes more pronounced with larger focal length.
The adapter for FD to EOS is indeed optical, but only because without optics, there is no way to achieve infinity focus. That's why some people here replace the mount entirely.
You might want to read this to get a better idea of what I'm talking about.
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