Kenn,
Probably best to post the dark, my guess is you have mixed up the calibration images.
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On 26 Nov 2020, at 3:29:25 pm, Kenn <
kennh@...> wrote:
Perhaps wrong group to post this to, but I assume most people here image the sky.
When ever I use darks I always, without fail, get ugly dark spots in my calibrated images. I use Darks, Flats, Bias, and Lights in CCD Stack v2.95. When I disable using Darks I do not get the dark spots. Within the Calibration Manager I specify a dark master and check the Subtract from flat option using a Bias Master. In the Flat Field tab I select the correct color flat and the same Bias Master. When I use the Darks I'm able to obtain a 'flatter' calibrated image but get those nasty black spots. I do dither my images and some have said not to use the Darks, but when I don't use the Darks the calibrated image is not as 'flat' as when I use Dark Master.
Any suggestions why the dark spots appear?
See attached as an example.<Art LUM 20201118 scaled scaled.jpg>
Kenn
