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Aperture diaphram on mamiya secor lens 80mm f/2.8

While moving the aperture ring on the mamiya secor c lens (removed from body) I see no diaphram closing/opening like on 35mm format lenses.the camera is 645 1000s purchased recently off ebay and seems to be in otherwise good shape.

Thanks for your help!

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The lens has a lever marked A/M near the aperture ring. If the lever is in the 'A' position, the lens will stay wide open until you trip the control lever at the back of the lens next to the rear optics. In the 'M' setting, you can see the aperture move as you change the f-stop setting on the ring. Set the lens to anything but wide open and move the control lever with your finger. You should see that aperture move.

Posted on Jan 14, 2008

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Posted on Jan 02, 2017

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The lens does not have a shutter - that's in the camera body. The lens contains the aperture or f stop adjustment. It is done by injecting or retracting blades in the light stream of the lens barrel between the front and rear optics. Check the aperture blades to see if they move easily and open equally by varying the f-stop ring on the lens while looking through it. If not moving all the blades the same amount or it does not continue to restrict the opening as you increase the f-stop value, there's something wrong with the lens.

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I have a Nikon D70, and a Quantaray lens (28-90mm). I have had this camera for about four months, and it has been working fine with the lens. When I received the camera, the aperture ring moved, but the...


In order for the aperture to be controlled by the camera's program or primary and secondary control knobs, the lens must be set to the smallest opening - or highest number value f stop. The aperture must be operated by the ring if it is not left in the smallest opening position.

The FEE code you are seeing refers to a communication error between the lens and the camera body. Sometimes, simply removing the lens from the body and reseating it to the body will solve the problem. While the lens is off the body, carefully inspect the gold colored contacts on the lens and mating contacts on the camera body. Remove any dirt or debris found, being careful not to allow it to fall into the camera - or land on the back glass of the lens.

I found another explanation and possible remedy that stated:

"A flashing "FEE" is an improperly set aperture ring in 99.9% of all cases with this error message (i.e. user error). In very rare circumstances it can be caused by a damaged aperture ring (small lug broken from back edge) that can't "tell" the camera it is at the minimum position. If the aperture rings on the lens is set to minimum aperture (highest number) and locked there, but you still get a FEE error, it's possible that sloppy tolerances are causing the lens aperture ring to not move the little switch at the 8 o'clock position (on the D70 lens mount) as far as necessary to get a proper indication of minimum aperture. Try to see if the aperture ring (while locked) will move slightly when mounted on the camera to clear the FEE error.

Another remote possibility is that the little switch at the 8 o'clock position mentioned above is not functioning properly (sometimes they get dirty). Try "exercising" it by moving it back and forth with your finger, then try the lenses again. Usually FEE has nothing at all to do with CPU contacts (with a reverse engineered third party lens anything is possible I suppose), but it doesn't hurt to clean them to eliminate that possibility."

You can also try a different Nikon compatible lens. If the trouble is still present, the camera may need to be returned for repair. If the the problem goes away, then the issue is tied to the lens itself. This would mean the the lens needs repair.

I hope this helps and good luck! Please rate my reply - thanks!

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You're apparently using a lens with an aperture ring. Turn it to its smallest aperture (largest f/number). You control the aperture from the camera body, the same way as on a lens without an aperture ring.

If the lens doesn't have an aperture ring, clean the electrical contacts on the back of the lens and in the lens mount.

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Does the aperture work when you turn the ring and push the aperture pin on the mount in? The lens should close down to the set aperture when you do this. If it does, then atleast the lens is useable.
What is missing is the detent for the click stops. This is a spring loaded ball bearing that 'clicks' into notches inside the ring. If this is broken or missing, finding a spring the right size might be a challenge, the ball bearing less so. To remove the ring and base, unscrew 3 screws coinciding with the 3 notches in the back plate, visible when you set the ring to f8. the back should lift off easily. don't lose the screws. The ball bearing, if it is still there, should protrude from a small hole in the lens barrel in line with the f stop index mark on the lens. Good luck.
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