Hey Kevin (post #152) FOV for any camera in a scope is very close to ...
60
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(FL of scope / Sensor biggest mm)
The important thing is you do not have to be precise at all in the calc. Nearest roundings works just as well.
Examples ...
APS/C Canon sensor is 22.2mm x 14.8mm so the biggest mm dimension is 22.2mm. If your scope is 1000mm focal length then 1000 is easily divided if we round 22.2mm down to 20. So 1000/20 = 50. Then 60 / 50 is 1.2 degrees FOV.
If a sensor was 8mm on the longest edge then 1000mm FL / 8 is roughly 120, so the FOV is 60 / 120 = 0.5 degrees.
cheers
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