I have a question about night-sky pictures that I took back when the
Leonid asteroids were around. All of my pictures have a "hot spot"
more-or-less in the center of the frame.
I think I am seeing the effect of light pollution, because it is not
totally centered, tending to be brighter near the horizon:
http://users.rcn.com/rmwoods/startrack.jpg
but I got this regardless of the direction I pointed the camera,
and in this shot:
http://users.rcn.com/rmwoods/leonid.jpg
where the camera was aimed far above the horizon, the lower corners of
the picture, nearer the horizon, are darker than the center as well.
Technical details: Kodak Max 400 (GC 400-6), Zuiko 24mm 2.8, with the
lens wide open, OM-1 shutter set at B with a locking cable release.
Exposure lengths were in minutes (as opposed to seconds.) The negatives
had sufficient density that the frame edges are fully defined.
Does the Zuiko 24mm 2.8 have a problem with light fall-off at the edges?
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|
