Celestron Ultima 9.25" Advanced Astro Master 3.40 Dave Ek's Digital Setting Circle USB BackyardEOS GP USB DEC Motor Canon 450D Modded Orion ShortTube 80-A Guide Scope DBK21 Guide Camera
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Quote:Dwight, Thank you I have not played with flats yet, there is so much to learn to get good results. So as Gary also stated it is vignetting that has effected my images. Is this an error on my part or something that just happens?Thanks
Quote:After some thought on this I think it is the moon shining back into the telescope, would I be correct in this assumption
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Quote:Startools will take care of that vignetting in short order. No flats needed.
Quote: Nothing I have seen as yet states how many to take.
Quote:Yeah its a artifical method using subtraction and not the correct division correction. Vignetting is a variable transmission issue and NOT a gradiant issue. These artifical methods are fine to fix additive gradients from external light sources (moon, light pollution etc) but they do not correctly deal with vignetting. Real flats are always the best solution for vignetting combined with correct treatment from a calibration and stacking program such as Images Plus, Deep Sky Stacker, Nebulosity etc (i.e. applied as a flat)
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