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2. Celestron - Wikipedia

   en.wikipedia.org/wiki/Celestron

   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 ...

3. Neutral-density filter - Wikipedia

   en.wikipedia.org/wiki/Neutral-density_filter

   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.

4. DxOMark - Wikipedia

   en.wikipedia.org/wiki/DxOMark

   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 ...

5. DX encoding - Wikipedia

   en.wikipedia.org/wiki/DX_encoding

   DX-iX (data exchange - information exchange) is an expanded DX encoding system introduced in 1996 which was released as part of the Advanced Photo System (APS), which use a different cartridge and film size, also known as IX240 film. APS film and cameras were marketed with numerous brand names, most including an "ix" to emphasize the ...

6. Herschel 400 Catalogue - Wikipedia

   en.wikipedia.org/wiki/Herschel_400_Catalogue

   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.

7. Nature (TV program) - Wikipedia

   en.wikipedia.org/wiki/Nature_(TV_program)

   Nature is a wildlife television program produced by Thirteen/WNET New York. It has been distributed to United States public television stations by the PBS television service since its debut on October 10, 1982.