For a single out of focus stop that is otherwise fully illuminated, one can try to use a Newtonian secondary illumination calculator like Mel Bartels but I'm not sure how valid it is for such short distances. Using Mel's calculator and assuming the 32 mm stop is at the front of...
FoV and AoV can be calculated using equations (above) or by using an online calculator. It's often not necessary to precisely calculate FoV or AoV. Lens and camera manufacturers favor using the diagonal AoV when delivering specs. The human eye has an average field of view of about 170-180...
I guess I'm lazzy or did not excel in math. When I want to get eyepiece fov I just go to sky & telescope calculator page and plug in the scope and eyepiece parameters and get the results. I have been doing that as well. But I am viewing with a binoviewer which I believe has mo...
In my 714mm focal length refractor, that yields a True field of 2.167° using the field stop formula. That also exactly mimics the figure derived by calculating the image scale on the focal plane of the telescope per millimeter and multiplying by 27. Using the TF = AF/M formula, I deriv...