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Problems with aperature control on Canon FD mount lenses

This forum will be used to share information with Brevis35 users related to setup, tips and tricks etc.

Problems with aperature control on Canon FD mount lenses

New postby dustinmcshane on Sat Nov 13, 2010 9:07 pm

Hello everyone,

I am new to owning a 35mm DOF adapter. I just purchased the brevis35 mp2 and am happy so far. It came highly recommended and is constructed very well. Far superior to other models i have seen.

My issue is that when i mount my FD lenses i purchased (50mm 1.8, 28mm 2.8, and a 75-210) the mount engages the aperture to full and will not allow me to manually adjust the lens. It is essentially stuck wide open. IS THIS NORMAL? I was under the impression that the lens was still fully operational when attached. As I said, I am new to the unit, so It is most likely operator error but I am pretty adept at figuring stuff out and this oe has me stumped. Please help. Thanks.

Dustin McShane
Rochester NY
Posts: 2
Joined: Sat Nov 13, 2010 8:57 pm

Re: Problems with aperature control on Canon FD mount lenses

New postby Hubert Den Draak on Wed Nov 17, 2010 4:27 pm

Hi Dustin,

Yes, some FD lenses have that issue. This forum has a few threads with a solution for it, just use the "search" box top right and type "canon FD aperture".

A thread on making the FD lens' aperture work is here: viewtopic.php?t=910 (I think it's affectionately known as the "Q-tip solution") and an external thread here: ... /index.htm

Also check this good thread on FD glass in general, here: viewtopic.php?f=7&t=2023

These should have more than enough information to get you going'! :-)
Hubert Den Draak
Posts: 64
Joined: Sat Oct 27, 2007 2:16 pm

Re: Problems with aperature control on Canon FD mount lenses

New postby dustinmcshane on Mon Dec 06, 2010 12:17 pm

Thank you very much. Just got back home and tried your suggestions. the Q-tip method, while not highly scientific, is certainly effective. They seem to be functioning properly now and all is once again... good.

Posts: 2
Joined: Sat Nov 13, 2010 8:57 pm

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