Quote:
Originally Posted by Ross G
Hi Marc,
I did see ring reflections in my light frames of the Horse Head, probably due to the brightness of Alnitak.
What would be the lowest exposure that I could use for the flat frames?
Thanks and hopefully see you on Wednesday.
Ross
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If you dim your lightbox then you can lengthen your exposures. Dim you lightbox until you don't get any reflections and shoot longer flats. I sometime shoot 8s flats with a Ha filter.