Canon FD 28mm 1:2:8 aperture ring not functioning?

<p>I have a Canon FD 28mm lens, not the kind with the silver ring. I know that the lens must be mounted to the camera in order for the aperture to work, however, when it is mounted the aperture remains wide open even though I am turning the ring all the way to 22. In the viewfinder, the frame does not get darker like with my 50mm lens with the silver ring.<br>

Oddly, when I go to mount the lens, while turning it into the locked position, I can see the aperture close down, then when locked it opens back up and remains that way. <br>

The camera's meter functions though, which seems odd since the aperture stays open. For example, the loop moves up and down the frame as I rotate the aperture ring or change the shutter speed, and then the needle lines up with it as need be. <br>

How do I fix this?</p>

 

<p>UPDATE: I found a Youtube video explaining how to "enable manual aperture adjustment" here:

<br />So I did exactly as shown, and my lens does exactly what his lens does. But when I put the lens back onto the camera, the aperture remains open even when rotating the aperture ring. Shouldn't my camera's viewfinder get darker as I rotate the ring (I have an AT-1)? Or does it stop down to whatever I set it as when pressing the shutter? </p>

<p>Right, it stops down when you trip the shutter. Put the camera on B or a slow shutter speed and watch when you trip the shutter to see if it's stopping down.</p>

<p>Thanks! Yes, just did exactly that and saw that it closes down. Phew!</p>

<p>Although you got your issue solved, you might be interested in the history how the FD lenses in general work. This site is a good resource for many things Canon: http://www.mir.com.my/rb/photography/companies/canon/fdresources/fdlenses/index1.htm</p>

<p>Thank you! Always great to have background info.</p>