Canon FD 50mm lens urgent question!

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Tenubracon

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Hi All,
Can anyone answer a simple question for me? I recently sold a Canon 50mm FD lens for a friend (I have never used Canon). The buyer has queried whether the lens is working properly because he cannot open and close the aperture by using the aperture ring. I know on a Nikon lens you can do this, but wanted to check if the same is true with Canon FD lenses.
Thanks in advance!
 
I may be wrong, but don't you have to have the DOF preview button press for the aperture blades to move within the lens?

Also AFAIK it's not compatible with a DSLR without some form of adapter, and even then i've heard that some lenses get belted by the mirror when shooting.
 
I've never owned any FD kit so I can't answer the first question, but for the second question however, you can mount FD glass on Canon EOS mount cameras via an adapter but as the flange length is shorter in the EOS mount infinity focus is lost unless you get an adapter with a corrective lens element which acts as a short teleconverter (about 1.2x) and will usually degrade the image quality, especially if its a cheap adapter.
 
The aperture doesn't work when the lens is off the camera....for the FD there is a work around, but FDN is more fiddly
 
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