What is the field of view of a telescope magnifying 80×, using an eyepiece with an apparent field of view of 75°?
0.94° or 56.4'. We find this value with the formula for the field of view of a telescope:
fov = fovₐ/m = 75°/80 = 0.94°
This value is almost a full degree, which is enough to contain two times the Moon, or the Nebula Carina, the brightest nebula in the night sky.
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