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When entering the values for a finderscope you may not have its actual prime focal length, the focal length of the eye piece or its FOV so you will need a work around. Finding the two focal length is easy enough with a measuring stick, the magnification and a bit of maths.
The eyepiece will probably not have any sort of compound lens so its FOV will probably be around 40 degrees and there probably won't be any field stop.
After entering "suitable" values into the calculator you will probably still need to fiddle eyepiece FOV to get the right window in stellarium.
Barry
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