The filter wheel in my STL camera has suddenly decided to position the
lum filter at random. Never exactly the same spot but never too far
off. Result is a flat fielded image that makes the donuts look 3D in
the final picture. Each time I go back to the lum filter it is
positioned just slightly differently. Though a couple times it was more
than 2 degrees off. The other filter positions line up fine, just the
lum filter that is screwy. Since I'm using a SCT I suppose I could take
it out without much if any harm but I'd like to get this stabilized.

Any ideas?

Rick

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Correct domain name is arvig and it is net not com. Prefix is correct.
Third character is a zero rather than a capital "Oh".