jc_mcguire Posted April 26, 2013 Share Posted April 26, 2013 <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> Link to comment Share on other sites More sharing options...
jc_mcguire Posted April 26, 2013 Author Share Posted April 26, 2013 <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> Link to comment Share on other sites More sharing options...
steve_mareno1 Posted April 26, 2013 Share Posted April 26, 2013 <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> Link to comment Share on other sites More sharing options...
jc_mcguire Posted April 26, 2013 Author Share Posted April 26, 2013 <p>Thanks! Yes, just did exactly that and saw that it closes down. Phew!</p> Link to comment Share on other sites More sharing options...
SCL Posted April 26, 2013 Share Posted April 26, 2013 <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> Link to comment Share on other sites More sharing options...
jc_mcguire Posted April 26, 2013 Author Share Posted April 26, 2013 <p>Thank you! Always great to have background info.</p> Link to comment Share on other sites More sharing options...
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