Actually this could be an alternative (or addition) to default telrad circles. User would define multiple "eyepiece circles", each specified by its real FOV and each having a short label input by user (hence no need to calculate RFOV from the scope and eyepiece params) The algorithm for picking an eyepiece circle to display would be very similar to that one for picking telrad circles. RFOV and user label would be displayed on left and right sides of the eyepiece circle.
Obviously, adding a setting to flip the view horizontally and/or vertically is a prerequisite for sensible using such "eyepiece circles".
Actually this could be an alternative (or addition) to default telrad circles. User would define multiple "eyepiece circles", each specified by its real FOV and each having a short label input by user (hence no need to calculate RFOV from the scope and eyepiece params) The algorithm for picking an eyepiece circle to display would be very similar to that one for picking telrad circles. RFOV and user label would be displayed on left and right sides of the eyepiece circle.
Obviously, adding a setting to flip the view horizontally and/or vertically is a prerequisite for sensible using such "eyepiece circles".