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5ash - yes, it's cropped. Using the focal reducer and the 1.25" filter creates a fair amount of vignetting on the big 22x15mm DSLR chip. I can usually get rid of most/all with flats, but with this amount of vignetting getting the flat exposure right can be fiddly. Easier to crop an image that has a single central object of interest.
Chris - I used around 30 darks, 20 flats, 20 dark flats. ISO 800, which is the "sweet spot" for S/N for this camera.
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