Larry,
I attempted to capture Geminids earlier this month with a Zuiko 50/1.4. The
same effect was apparant. I believe any lens is susceptible to falloff when
wide open.
Mickey
----- Original Message -----
From: "Larry Woods" <lmwoods@xxxxxxx>
To: <olympus@xxxxxxxxxxxxxxx>
Sent: Friday, December 28, 2001 10:00 PM
Subject: [OM] Vignetting, light pollution or both?
> 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?
>
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