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Any telescope will work for Mars, but a 4-inch refractor or a 6-inch reflector are the recommended minimum, with a high power of 175x : r/space
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Pro's + Con's 4-5" Achro Refractor VS 6-8" Newt? - Beginners Forum (No Astrophotography) - Cloudy Nights
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Telescope common aperture size comparison chart - Beginners Forum (No Astrophotography) - Cloudy Nights
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