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FOV calculations
The original question was (edited):
Does any one know how to calculate the FOV from the specs?
For example, with my Orion EON:
Aperture 85 mm, focal length 560 mm, f-ratio 6.6
The FOV seen on the screen is about 3.4 X 2.6 degrees.
With the Skywatcher Esprit 150mm
Aperture 150 mm, focal length 1050 mm, f-ratio 7
What would be the FOV you end up with (aside from the answer...smaller)??
I suppose that the term 'field radius' might come into it as well??
I just searched astrobin for Esprit 150mm.
The average field radius was 0.5 - 0.6 degrees.
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