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A prime focus telescope design. The observer/camera is at the focal point (shown as a red X). In a prime focus design no secondary optics are used, the image is accessed at the focal point of the primary mirror. At the focal point is some type of structure for holding a film plate or electronic detector.
The first of these was the Hamiltonian telescope patented by W. F. Hamilton in 1814. The Schupmann medial telescope designed by German optician Ludwig Schupmann near the end of the 19th century placed the catadioptric mirror beyond the focus of the refractor primary and added a third correcting/focusing lens to the system.
Broncolor Scoro 3200S wifi- photography lighting powerpack Broncolor Para 222 Reflector broncolor's Para line of parabolic light reflectors have become a leading item for the company. Compatible with flash, and HMI lamps, the Paras range from 88CM to 330CM.
An oblique projection of a focus-balanced parabolic reflector. It is sometimes useful if the centre of mass of a reflector dish coincides with its focus.This allows it to be easily turned so it can be aimed at a moving source of light, such as the Sun in the sky, while its focus, where the target is located, is stationary.
The centrally located sub-reflector serves to focus radio frequency signals in a similar fashion to optical telescopes. An example of a cassegrain radio antenna is the 70-meter dish at JPL's Goldstone antenna complex. For this antenna, the final focus is in front of the primary, at the top of the pedestal protruding from the mirror.
Left to right: MR16 with GU10 base, MR16 with GU5.3 base, MR11 with GU4 or GZ4 base Line drawing of an LED MR16 lamp, with a heatsink rather than a reflector. A multifaceted reflector (often abbreviated MR) light bulb is a reflector housing format for halogen as well as some LED and fluorescent lamps.
Elinchrom supplies a range of lighting modifiers as accessories for their lights. Some accessories (such as umbrellas) attach to the light unit by means of a pole passing through a 7 mm hole through the head, and others (such as softboxes, reflector dishes and snoots) attach using Elinchrom's bayonet system.
Visible-light camera and spectrograph with the ability to take spectra of up to 100 objects simultaneously, mounts on the Cassegrain focus. Subaru Prime Focus Camera (Suprime-Cam) 80-megapixel wide-field visible-light camera, mounts at the prime focus. Superseded by the Hyper Suprime-Cam in 2012, decommissioned in May 2017.
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