Ef

where dCCD is the size of the CCD, E is the enlargement provided by the lens, and Fis the focal length of the optical system. For reference, the angular size of Mars at opposition varies between 13 and 25 arcseconds, the ball of Saturn is 18 arcseconds and the rings are about 40 arcseconds from tip to tip, and the giant Jupiter ranges from 40 to 48 arcseconds across the equator. Even at fairly high magnification, these objects appear quite small in a telescopic field of view.

What is the field of view in making CCD images with a 12-inch telescope operating at a focal ratio of//40, using a camera with a 6.9 x 4.6 mm sensor? The fields of view across the 6.9 and 4.6 mm dimensions of the CCD are:

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