On 2/23/2018 3:14 PM, Mark Kronquist wrote:
Verbosity is the soul of wit? No?
Okay I had to leave for a meeting. I thought, at first, one of my OM-4ts was
acting up NOPE fine ditto OM 3
Got back tried on OM 1 and OM 2 all variants no release
Weird
Okay DOF preview not working aperture not stopping down
The only thing that can be is trouble with the aperture stop down tab. The DoF preview button and the stop down lever in
the camera body both work, quite separately, by operating that tab.
The DoF preview button is not dependent on being mounted on a body. Set to a small aperture and move the tab. If the
diaphragm closes, that's OK. If it doesn't work, the lens can't work properly on any body.
Now use the DoF button. It should do exactly what your finger just did, push the tab around in its slot. If that doesn't
work, it doesn't matter for camera operation, but you could fix it. The mechanisms are right under the mount and rather
simple.
If the DoF button works off the body, but not on it, there is some sort of mechanical interference. If the tab is bent
sideways, and rubbing on the side of the mount, that would tent to close the aperture as the lens is mounted on the
body. When you say the DoF preview doesn't work, is that by looking into the lens, or by looking through the VF? If the
later, and it's already stopped down from rubbing, you won't see any change in VF brightness when you push the DoF
button, but in the lens, the aperture may be stopped down.
If the tab is bent out, the stop down lever might miss it.
It's possible for the tab to be short, bent down or shortened somehow. The body stop down lever then could miss it. But
that would not affect the DoF button. If the DoF button doesn't work off camera, there are two problems.
Diagnostic Moose
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What if the Hokey Pokey *IS* what it's all about?
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