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This is a list of large optical telescopes. For telescopes larger than 3 meters in aperture see List of largest optical reflecting telescopes . This list combines large or expensive reflecting telescopes from any era, as what constitutes famous reflector has changed over time.
Ultimately, a valid comparison between two telescopes must take into consideration more specifications, when a general measurement becomes obtuse. Aperture of the primary mirror alone can be poor measure of a reflective telescope's significance; for example, the Hubble Space Telescope has only a 2.4 metres (94 in) primary mirror.
The following are lists of devices categorized as types of telescopes or devices associated with telescopes.They are broken into major classifications with many variations due to professional, amateur, and commercial sub-types.
Because telescopic sights universally have a round main tube, the standard mounting method is to use scope rings, which are essentially round metal pipe shoes that clamp firmly onto the telescopic sight body. Most commonly, a pair of scope rings are used, though unusually short telescopic sights occasionally do use only a single scope ring.
Telescopic glasses are "basically binoculars" that affix to glasses and magnify images so that objects look bigger, closer and clearer, said Palmer, who has specialized in this area since 2008 ...
The Swedish 1-m Solar Telescope, with a lens diameter of 43 inches, is technically the largest, with 39 inches clear for the aperture.The second largest refracting telescope in the world is the Yerkes Observatory 40 inch (102 cm) refractor, used for astronomical and scientific observation for over a century.