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Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
One main disadvantage of neutral-density (ND) filters is that different shooting situations often require a variety of filters, which can become quite expensive. For example, using screw-on filters requires a separate set for each lens diameter, though inexpensive step-up rings can minimize this requirement.
The DXOMARK Lens Score provides ratings for camera lenses, as tested using its proprietary tool-set in combination with various camera models. [ 8 ] [ 10 ] [ 17 ] As with the DxOMark Sensor Score , the DXOMARK Lens Score is an aggregation of five separate sub-scores; namely: sharpness, distortion , vignetting , transmission, and chromatic ...
The Herschel 400 catalogue is a subset of William Herschel's original Catalogue of Nebulae and Clusters of Stars, selected by Brenda F. Guzman (Branchett), Lydel Guzman, Paul Jones, James Morris, Peggy Taylor and Sara Saey of the Ancient City Astronomy Club in St. Augustine, Florida, United States c. 1980.
Fluorescent lamps in various embodiments. Since their introduction as a commercial product in 1939, many different types of fluorescent lamp have been introduced. Systematic nomenclature identifies mass-market lamps as to overall shape, power rating, length, color, and other electrical and illuminating characteristics.
The Chinese armaments industry and the Chinese military were informed about the developments and experience that the US armed forces had during the Vietnam War with the M16 rifle and its 5.56×45mm M193 ammunition – not least because of the arms aid for Vietnam, as a result of which there was a high probability that captured US small arms and ammunition reached China.
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