flat field

In search of the flat field

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I’ve been thinking about the problem of evaluating my flat field lighting and target, and two approaches came to mind. One is to make some flats, rotate the camera 180 degrees, make more flats, and then measure the difference.  I haven’t done that, but it seems like it should work.  The other method is to … Read more

Focus, Flats and NGC 80

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No moon, the evening started with thin cirrus clouds that disappeared, I think an hour or so after sunset.  With those kind of clouds, I’m never sure, I think they are actually there to make halos and generally degrade the image, but you can’t see them.  I thought good enough for a focus run with … Read more