Some OM bodies have a mirror stop tab, backed with a spring that the mirror
slaps against when it stops. Pressing the mrror aginst the stop may flex
the spring and not give a true indication if the mirror is resting at the
correct point.
Mirror angle can commonly go out as a result of impact.
John
William Sommerwerck wrote:
> Sean Chan has determined that since all his lenses refuse to reach
> infinity, and close-ups are misfocused, there must be something wrong
> with the camera.
>
> One obvious possibility is that the mirror isn't coming all the way
> down. There's a tiny pin on the side of the mirror chamber that the
> mirror rests against. If you lift the mirror and let it fall back, you
> should be able to tell whether the mirror touches the pin when the
> mirror is down. (If you can push the mirror farther down, it obviously
> isn't resting on the stop.)
>
> Another possibility is that the focusing screen is not in the right
> plane. Remove the screen and look to see if there's any dirt on the
> screen or frame that might keep the screen from sitting flush. When you
> reinsert the screen, check that it's aligned correctly and frame closes
> "flush" over the screen.
>
> The only remaining obvious thing is that the camera is grossly
> misassembled. This is hardly likely, since this sample presumably worked
> correctly before.
>
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