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When the two mirrors are on one mount, the combined mirror spacing of the Large Binocular Telescope (22.8 m) allows fuller use of the aperture synthesis. Largest does not always equate to being the best telescopes, and overall light gathering power of the optical system can be a poor measure of a telescope's performance.
This makes it more comfortable to view with an 8×40 than an 8×25. A pair of 10×50 binoculars is better than a pair of 8×40 binoculars for magnification, sharpness and luminous flux. Objective diameter is usually expressed in millimeters. It is customary to categorize binoculars by the magnification × the objective diameter; e.g., 7×50.
Large Binocular Telescope (LBT) 8.4 m x 2 (22.8 m LBTI) [5] 464.5" glass mirror reflector – Multi-mirror (2) World's largest 2008 with Beam Combiner: Mount Graham International Observatory, Arizona, USA: 2005 Hobby-Eberly Telescope: 9.2 m: 362" Reflector – Segmented, 91: First HET: McDonald Observatory, USA: 1997 Keck 1: 10 m: 394 ...
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The Large Binocular Telescope at the Mount Graham International Observatory in Arizona uses two curved mirrors to gather light. An optical telescope gathers and focuses light mainly from the visible part of the electromagnetic spectrum, to create a magnified image for direct visual inspection, to make a photograph, or to collect data through electronic image sensors.
A magnification factor of 10, for example, produces an image as if one were 10 times closer to the object. The amount of magnification depends upon the application the telescopic sight is designed for. Lower magnifications lead to less susceptibility to shaking. A larger magnification leads to a smaller field of view.