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In a microscope with an ocular magnification of 10 and an objective magnification of 20, the total magnification would be 200x. Magnification in Telescopes. The formula for total magnification of a telescope is the focal length of the objective lens divided by the focal length of the eyepiece lens.
Thanks everyone. If I understand correctly, magnification refers to the image size at the film plane which is the same regardless of whether the camera is 35mm or digital. The field of view depends on the focal length and the size of the negative or sensor. Therefore, a 100mm lens on a digital camera with a 1.5X crop factor will have the same field of view as a 150mm lens on a 35mm camera, but the two lenses will not produce the same magnification (at the film plane).