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Will Flats Fix This?
Hello,
I am relatively new to astrophotgraphy and so far things have gone smoothly. I have not bothered with darks or flats, relying on ICNR and I have been happy with my photos.
However the slightly elongated stars at the edges of my photos have started to bother me so I recently purchased a WO Field Flattener II for my WO Megerez 110mm f5.95 refractor.
I tested it the other night, shooting 10 min exposures of the Horse Head region in Orion from my backyard in suburban Sydney. Although the stars in the corners were much better, I also noticed a darkening of the corners.
Upon using DSS to stack about 10 of these exposures, I was surprised to see the corners very dark...see the attached photo.
My question is, can I compensate for this by using flats or is the vigneting too severe? If so, are there any other solutions?
Thank you.
Ross
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