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There are three main types of optical telescopes - and these are divided into subgroups. They all have their different advantages and disadvantages and they are used in different areas of astronomy. Refractors (Dioptrics) Reflectors (Catoptrics) Combined Lens-Mirror Systems (Catadioptrics) These types can be mounted on different types of mounts. Altazimuth (ALT-AZ) Mounts Equatorial mounts Other mounts Telescopes with a unique optical/mount designs
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