Hi, I was thinking about trying out some FD lens, for e.g. getting a super telephoto lens say 400mm for not so frequent birding shots butgetting a EF 400mm prime lens is expensive (except those cheap cheap versions) and might not be worth it since I don't use it often.
So I was wondering how is it like to use FD lens with the adapter with glass for infinity focus. Also how different would it be from using 3rd party manual focus lens with adapters (no glass, e.g. m42 to ef mount).
Read some comments online and was mentioned that it wasn't recommended. So I thought it would be nice to hear from local users who have experience in using FD lens.