Hi, the Field Of View (FOV) of the long side of the detector is different from the short side of the detector. You only need to know one FOV in order to find the focal length, but you need to know which one exactly.
From there it's simple geometry. The focal length is:
FL = Detector / 2 * tan( FOV / 2 )
For example: With a FOV of 13° along the short axis of the detector (0,00375 mm * 960 pixels = 3.6 mm) the focal length would be 16 mm.
if along the long axis: 21 mm.
I was wondering Jasem, is it possible to use a small DIY telescope in stead of a iPolar in the iPolar software?
Latest Stellarmate on Rpi 4B, 294mm-pro, EFW-8, CEM70