I recently bought a Mamiya ZE Quartz with a Mamiya-Sekor E f/1.7 50mm lens that I recently found at an antique store. It's either been abused or been used a lot, but it's seen better days.

For some reason when I take the lens off and I look through it, its aperture is closed to f/16 even when I move the dial to f/1.7. It also only shoots in f/16 when it's attached to the camera. I read somewhere that the aperture is adjusted electronically because of the metal contacts on the body and on the lens but I'm not really sure since I've never shot with a Mamiya and I haven't tried it with batteries yet.


  • 2
    \$\begingroup\$ Did you say that the aperture is adjusted electronically, but you haven't used the camera with batteries? If it's controlled electronically, how is it supposed to work without batteries? \$\endgroup\$
    – scottbb
    Commented Jun 21, 2017 at 1:05

1 Answer 1


The Mamiya ZE is an electronic camera, without batteries it will fall back to a shutter speed of 1/90 s. The aperture should be wide open however, just like any other SLR, for focusing and metering. So the lens is likely defective.


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