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I am still green here.
Afocal: lens in webcam and using an eyepiece, then you will be viewing the same magnification as your eye thru the eyepiece.
Prime focus: no lens in webcam, no eyepiece in telescope and you get high magnification
Eyepiece projection: no lens in webcam, eyepiece in telescope, but you generally need an extension tube to focus that image on the ccd plane.
Eyepiece projection also give high magnification
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