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Pentax MV Aperture Problem


jonathan_moss

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Hi there,

Just bought a second hand Pentax MV 1970's camera, similar to the

K1000 but with auto shutter speeds. When i first got the camera, the

image lightened and darked when turning the aperture ring. After

loading the film, taking off the lens and putting it back on again,

the image no longer changes in brightness when I turn the ring. What

could be wrong? The aperture ring is still working, as the exposure

lights in the viewfinder change as they are meant to when moving the

ring, but the image stay the same. Any tips appreciated!

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Well to me it seems you manged to insert your lens properly. You'll see if you unlock the k mount and turn the lens a little bit out the aperture will close agin. A diaphragm closing only for the actual exposure is quite usefull to focus more precisely and faster. Later Pentax models had extra levers to stop the lens down to check DOF, but you don't really need it if you cheat as described above.
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