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The primary mirrors range from 12.5 inches to 25 inches in diameter and are supplied by Optical Mechanics, Inc. (OMI) and Ostahowski Optics, while secondary ones are supplied by United Lens. Accessories include the ServoCAT drive system, [5] JMI focusers, and Wildcard Innovations' Argo Navis Digital Telescope Computer (DTC). [6] [7]
If, instead of and , the known quantities are the focal length of the primary mirror, , and the distance to the focus behind the primary mirror, , then = / (+) and = +. For a Ritchey–Chrétien system, the conic constants K 1 {\displaystyle K_{1}} and K 2 {\displaystyle K_{2}} of the two mirrors are chosen so as to eliminate third-order ...
The GTC began its preliminary observations on 13 July 2007, using 12 segments of its primary mirror, made of Zerodur glass-ceramic by the German company Schott AG. Later, the number of segments was increased to a total of 36 hexagonal segments fully controlled by an active optics control system, working together as a reflective unit.
The LBT mirrors individually are the joint second-largest optical telescope in continental North America, next to the Hobby–Eberly Telescope in West Texas. It has the largest monolithic, or non-segmented, mirror in an optical telescope. Strehl ratios of 60–90% in the infrared H band and 95% in the infrared M band have been achieved by the ...
The 75 mm thick f/2 primary mirror is 4.24 meters in diameter with the outer 12 cm masked, leaving a 4-meter off-axis section of a 12-meter diameter, f/0.67 concave parabola. It was cast from Zerodur by Schott and polished at the Richard F. Caris Mirror Laboratory of the University of Arizona and aluminized by the AMOS mirror coating facility ...
Marketed in 1894, it was called the Protarlinse Series VII, the most highly corrected single combination lens with maximum apertures between f/11 and f/12.5, depending on its focal length. But the important thing about this Protarlinse is that two of these lens units can be mounted in the same lens barrel to form a compound lens of even greater ...
The twin 10-meter telescopes at W. M. Keck Observatory in Hawaii, the 8.2-meter Subaru Telescope sited next to them, the four 8.2-meter Unit Telescopes of ESO's Very Large Telescope and their predecessor the 3.6-meter New Technology Telescope are notable examples that support an array of specialized instruments on their Nasmyth platforms, with a similar design being used for the future Thirty ...
Engineers cleaning a test mirror with carbon dioxide snow, 2015 Main mirror assembly from the front with primary mirrors attached, November 2016 Diffraction spikes due to mirror segments and spider color-coded. Webb's primary mirror is a 6.5 m (21 ft)-diameter gold-coated beryllium reflector with a collecting area of 25.4 m 2 (273 sq ft). If it ...
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