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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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Re: aperture diaphram on mamiya secor lens 80mm f/2.8

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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You're using a lens with an aperture ring, right? Turn the ring to its smallest setting (largest f/number) and, if it has a lock, lock it. You can control the aperture from the camera body the same way as on a lens without an aperture ring.

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This means that the lens doesn't have its aperture ring set to its smallest opening.
Turn the aperture ring to its smallest opening (largest f/fnumber) and lock it if the lens has an aperture ring lock. You control the aperture from the body, the same way as with a lens without an aperture ring.

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If it's on an SLR then it means the lens is not set to its minimum aperture. Turn the aperture ring on the lens to its smallest opening (largest f/number) and lock it if it has a lock. You control the lens aperture from the body, exactly the same way as on a lens without an aperture ring.

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take your camera body to a camera store and try a different lens. if the meter reads correct then your lens needs to be repaired. if the meter is still off then your camera must be recalibrated.

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What lens are you using? Do you have other lenses you can try?

The F-- indicates that the camera and the lens are not communicating. There are several reasons for this:

1. The lens is not electronic. All lenses before the advent of autofocus fall into this category, as well as some of the newer ones. The only way these lenses can be used is in Manual (M) mode, without any assistance from the camera's light meter.

2. The lens has a locking aperture ring. In this case turn the aperture ring to the smallest aperture (largest f/number) and lock it. You control the aperture via the command dial on the camera body.

3. The contacts are dirty. Remove the lens, clean the contacts on the back of the lens and on the mount, then reattach the lens and see what happens.

4. The lens and/or camera body needs service.

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