I wonder if anyone tried polar alignment using a regular finderscope.
I have a motorized equatorial mount without a polar alignment scope. (EXOS NANO + RA drive motor)
I want to try to polar align using a 5x24 finderscope that I have and plan to attach parallel to the RA axis using a dovetail slot and rings with screws.
I have calculated the AFOV: from a distance (D) of 10m I can see a FOV of 1m diameter
Using this formula: AFOV = 2 X tan-1 (FOV / 2 X D) gives me 5.72 degrees (5o 43' 30")
Polaris is at a declination 89o 21' 09", that is 38' 51" from the celestial pole. or 0.65 degrees.
Inside the finderscope there is a crosshair where I'm thinking of inserting a "reticle".
The aperture in this point is 9.8mm, my "reticle" needs to have a circle with a radius of 1.1mm = (9.8 * 0.65) / 5.72
Anyone has done something similar? Please let me know if my calculations make sense.