How does one determine magnification? I have an Edmund Scientific Astroscan, 4-1/8-inch aperture, F/4.2 reflecting telescope, used with a 2.5x Barlow lens and a 28mm Plossl eyepiece.

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DSLR cameras excel in prime-focus (and eyepiece-projection) photography since they have removable lenses, making it easy to use a T-ring and adapter to connect the camera to the telescope focuser.