Canon FD mount problem! Help me...

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renixx
renixx Regular Member • Posts: 380
Canon FD mount problem! Help me...

Help me
yesterday I received a mint condition Canon FD 50 / 1,4 and with the K&F adapter (orange ring version) I mounted it (perfectly) on my Olympus OM10 (m4 / 3).
However, the aperture remains constantly open at 1.4 and there is no way to close it. I also tried with position "A" but nothing to do ... The apertures do not change.
What do you think I can do? The lens is mint and the ring also ... I don't know what to do ...

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