Does anyone know the FOV (in arc minutes) of the GS 8x50 right-angle finderscope?
I need it to place the correct circle in Cartes du Ciel.
I can't follow the instructions in the Help file coz I don't know what the 'apparent FOV' of anything is.
Thank you
Pic 1 shows where I have to put the value.
Pic 2 is the instructions that I can't follow coz I don't know the AFOV of EP's and finders.