Its not bad actually. It even adjusts the image brightness for the aperture of the telescope entered. All the way up to 24".
My only criticism is that if it is going to attempt to adjust image brightness for aperture it also needs to calculate it for exit pupil. M42 for instance is the same dim image in my 6" Mak with a 10 mm eyepiece as it supposedly in my 12" Dob with a 30 mm eyepieces. LOL no it isn't!
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