OK, I 've had a question for some time for you astrophotogs. In
exposures measuring from 10s of minutes to hours, what difference does
mirror lock-up make? Mirror, aperture and shutter crash-bang all damp
down in maybe a second or 2. So out of all the light that makes up even
a 2 min. exposure, less than 1 0s disturbed. How can that affect the
image? None of that light which is in the wrong place, and a moving
wrong place at that, will even register on the film.
Moose
Chuck Norcutt wrote:
As others have said, what you want is an OM-1 which, in addition to
its other desirable traits is fairly cheap. In addition to the
interchangeable screens (a trait shared with all "single digit" OM
bodies, ie; OM-1,2,3 and 4) the OM-1 offers mirror lock-up (minimizes
vibration) and a mechanical shutter (prevents battery drain during
long esposures).
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