So I'm trying to setup Cartes du Ciel with my equipment and doing FOV for my eyepieces is a breeze (cause I know the formula), but I have no idea if there is similar for an 8x50 or 9x50 or 6x40 etc. finderscope.
I could just go outside and by using the finder 'guess' at the FOV for the finder, but I'm sure one of youse guys will be able to tell me how this is worked out mathamatically.
Thanx in advance
Mr Lazy
VAZ