Canon FD 500mm Lock Mechanism play

Fellow Photographers: I Have the Canon FD 500mm f8 Reflex lens. My

question is that when you rotate the lens in to the lock position

there is quite a bit of play in the back and forth movement, I have

been told that this is acceptable, but when you remove the drop in

filter you can see the lock mechanism, when you rotate the lock part

you can see the very small screws move up and down does any body

have the same lens like this or can I remove the back of the mount

and tighten up the screws my self, and if possible how do you take

of the back mount. Appreciate any help as the lens has had very

little use. Kind regards. Mike

Mike,

This is a non-answer, I'm afraid. Do you have the breechlock or "new" version of this lens? I have the new version, and both the camera mounting lock and the rotating-barrel lock are quite tight. I can see nothing of the camera mount lock through the filter slot. All I see of the rotation lock is the piece into which the lock tab fits. It has screws. I'm not sure which of the two mechanisms you're referring to.

My main reason in responding is to say that this mount is unique among all the FD lenses, what with the rotating part and the lack of diaphragm levers. That's probably why you've not received a response. If you're courageous about tearing into it, the good news probably is that this mount is simpler than the others.

Alen,

Thanks for taking the time to responded to FD Canon 500mm lens problem, as it turn out the hole lens had to be dismantled in order to get to the screws that hold the lock rotating mechanism together.

Again thank you for you help I appreciate that.

Best regards. Mike.