Astromania 1.25" 45-Degree Diagonal Prism Optical Prism Inside Rather Than a Mirror which Makes Your Image Clear and Sharp
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It's well known that the principle of reflecting telescope is reflection, which means that if you reflect it again through a diagonal prism, you lose some of the brightness of the image. Also, it's hard to match the focal length and diameter of the telescope. As a result, it is not recommended to use a diagonal prism on a Newtonian Reflector Telescope.