WebAfocal system. In optics an afocal system (a system without focus) is an optical system that produces no net convergence or divergence of the beam, i.e. has an infinite effective focal length. [1] This type of system can be created with a pair of optical elements where the distance between the elements is equal to the sum of each element's ... The Cassegrain reflector is a combination of a primary concave mirror and a secondary convex mirror, often used in optical telescopes and radio antennas, the main characteristic being that the optical path folds back onto itself, relative to the optical system's primary mirror entrance aperture. This … See more "Classic" Cassegrain telescopes The "classic" Cassegrain has a parabolic primary mirror and a hyperbolic secondary mirror that reflects the light back down through a hole in the primary. Folding the optics makes this a … See more Cassegrain designs are also utilized in satellite telecommunication earth station antennas and radio telescopes, ranging in size from 2.4 metres to 70 metres. The centrally located … See more • Media related to Cassegrain telescopes at Wikimedia Commons See more Catadioptric Cassegrains use two mirrors, often with a spherical primary mirror to reduce cost, combined with refractive corrector … See more • Catadioptric system • Celestron (Schmidt–Cassegrains, Maksutov Cassegrains) See more
Katadioptrische Foto-Objektive – fotosaurier
WebApr 28, 2008 · Joined: 14 Jan 2005. Posted 30 November 2015 - 10:41 AM. I have opted for the 350 mm f/17 Planeta Cassegrain ... which is a bit heavier than the 300 mm version but the only Cassegrain which we can compare to the 350 mm C14 Schmidt-Cassegrain Telescope. Although the C14 is f/11, while the CFF 350 is f/17. Web77mm Filtergewinde, Bildstabilisator schwarz Canon Objektiv EF 24-105mm F4L IS II USM Zoomobjektiv Teleobjektiv Lens für EOS. High-End zeitgenössische Mode Hot Pin ausbrechen Stil 77mm Filtergewinde, Bildstabilisator schwarz Canon Objektiv EF 24-105mm F4L IS II USM Zoomobjektiv Teleobjektiv Lens für EOS Wareneinkaufsplattform … ez-frisk
Cassegrain antenna - Wikipedia
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