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Originally Posted by Hitchhiker
Taking the IR filter out will help you on objects that are emitting strongly in the red (Ha) part of the visible spectrum like the horsehead, eta carina, and M42. Probably will not help on galaxies and star clusters.
Glad you got rid of your donuts but you'd better read up on flat fields!
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Thanks Adam. I guess all red glowing objects i should take out the IR Filter. Stuff don't get flat field stuff
