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The needle is moving to the extreme down, and the red dot is blinking. And when I trigger, no diapgram is closing.

So the meter is not working because the lever can't move ? It's weird because : - If it stay at the top, it means that my apperture is 1.8, so if I do the mesure into a black room, it should tell me that it's okay, but it's not ... - If I use the "stopped-down lever", this lever is working again, so the mesure should work on this case, but it's not.

Thanks for your reply. About the lever on the right. From my point of view, I think it should move freely. The lever of the lens is making a counterweight on the lever of the camera. The lever of the lens have multiple position, one for each aperture stop. This is this mecanism that tell the camera which aperture I've choose from the ring. But because I have no other AE1 (working) front of me, I can't be sure. The purpose of this lever is only to close the diaphragm, right ? Sorry I didn't understand what did you say "actually stops down the lens". For me, the red dot should be cover (mask), not visible. If the red dot is visible, it means that the lever is engaged. Is it possible to you to confirm me that, both levers is moving freely or lock, when camera is cocked or not ? Thanks you for your advice about buying another one, especially the program version.

I only have this lens. The lever on the right (the diaphragm control lever) is impossible to move with my hands. I can't move it freely. What I see about this lever is : - When I "charge" the camera, this lever is moving about 1mm approx (but is not moving down, and if I touch it at the same time, it's still impossible to move it) - when I charge de camera then I engage the stopped-down lever, I can move the diaphragm control lever freely. So, this lever should move freely when the camera is not charge ? And when it's charged ? I think it's should not move freely because the mesure is happening at the full apperture. If it's moving freely, the diaphragm will close.

Hello all, I bought a canon AE1 (not program) long time ago, and I discover that diaphragm is not closing when i trigger the release button. My lens is an old FD 85mm S.S.C with no release button and a chrome ring. And the battery is good. I also try to "play" with the diaphragm of the lens when it's unmount. I move the "spindle" (or lever) (at the opposite side of the red point) and the diaphragm is closing well. What I do : I put the aperture ring to f16, I put the shutter speed to bulb. I arm the camera. I open the backside of the camera with no film to see what's happening through the lens. When I shoot and stay the button press, I see that the diaphragm is not close. I suspect the "diaphragm control lever" (cf page 2 of this service document on this page) because I see the control lever still at the top. And when the control lever is still at the top, one of the spindle/lever (the spindle that move when I lock/release the lens from the camera) of the lens is also at the top, which prevent the diaphragm to close. I did a second test : I put the aperture ring to f16, I put the shutter speed to bulb. I arm the camera and I open the backside of the camera with no film to see what's happening through the lens. But this time, I action the "stopped-down lever", I see from the front of the lens that the diaphragm is now close (finally). I release the "stopped-down lever". Then now I shoot and stay the button press, I see that the diaphragm is close and the "diaphragm control lever" is down ! Perfect ! If I shoot again but with no "stopped-down lever", the diagram will not close again. So, why the diaphragm is not closing ? I have to tell you that the exposure mesure is not functioning, the needle is always go down, even with a lot of light Thanks a lot