[Aavso-photometry] Light box question

[Tom Krajci]

Hi Bob!

>However, there are sometimes
>residual artifacts in my images made with light box flats, especially
>in stacked images.  These are usually at the ~1% level and affect
>mainly the edges of the frame.  I'd like to improve on this.

>Since my L.B. uses tungsten light bulbs which emit a lot of IR, there
>is a mismatch between that and my night sky which has a fair amount of
>light pollution and, on some nights, moonlight or twilight.

You say your problem is mostly at the CCD frame edges?  If that is the case,
it's more likely that your problem is scattered light/baffling, rather than
the IR flux from your light source.

Do you have any sample images, photos/diagrams of your light box, scope,
baffling, etc.?

Thanks in advance.

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Tom Krajci
Cloudcroft, New Mexico
http://overton2.tamu.edu/aset/krajci/

Center for Backyard Astrophysics (CBA)
http://cba.phys.columbia.edu CBA New Mexico

American Association of Variable Star
Observers (AAVSO): KTC http://www.aavso.org/
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