Quote Originally Posted by Greg_E View Post
Would be nice if they showed the light source portion and the pickup portion. If the pickup is the little round thing on the end, then it will be just about useless. In an ideal tester the pickup should be mounted at the film plane and the back sealed off so that stray light does not enter, I can't see how you can do that with this tester.
Gotta go with Greg on this one. It mentions shutter speed but a large part of adjusting a focal plane shutter is knowing what the curtain travel times are.
If they're out of balance you can have uneven exposures.
The Omes device should be OK for leaf shutters though since you're just dealing with exposure and sensor size doesn't matter.