I use Kstars as well for photometry. Another really useful function would be able to draw a circle or place an aperture in fits viewer to get a simple measurement of maximum and mean pixel count. This would help me a lot when getting the exposure correct before running a variable star or exoplanet sequence of images. At the moment after taking a test image I can see it in fits viewer and can move mouse around the stellar image but its difficult to pick up the maximum count. I usually open the fit file in AstroImageJ just to make this measurement. Would you find that function useful?

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