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Re: [OM] More Leonid images

Subject: Re: [OM] More Leonid images
From: "Ralf Loi" <ralf_loi@xxxxxxxxxx>
Date: Tue, 20 Nov 2001 11:13:09 +0100
Gary wrote:
<<All of the cameras suffered badly from an unknown source of central
fogging.>>

Images are fine. The problem you experienced is vignetting. The fact that
the sky does not became black on
the photo means that you reached the exposure limit: also the darkest sky
is "bright", and increasing the
exposure time makes that evident.
And there is also the problem that the sky goes brighter when moving from
the zenit to the horizon
(so your central fogging is not perfectly simmetrical).

Ralf Loi



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