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This is a list of smartphones with a telephoto lens that offers a focal length (35mm equivalent) of at least 100mm or "4× optical zoom" with an imaging area equivalent to a 1/3.5″ or larger sensor. Smartphone lenses are often marketed in terms of "optical zoom" [1] relative to the phone's main camera. For example, 120mm is usually referred ...
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A triplet lens A Steinheil triplet telescope eyepiece. The three lenses may be cemented together, as in the Steinheil triplet (optimized for finite conjugate ratio) or the Hastings triplet (optimized for infinite conjugate ratio). [2] Or a triplet may be designed with three spaced glasses, as in the Cooke triplet. The former has the advantage ...
Schneider-Kreuznach MACRO-SYMMAR 2.4/85 Schneider-Kreuznach TS 90mm lens The Macro-Symmar HM is a variation of the Symmar design, engineered for 1:1 macro work and flat-field copying. The 80 mm is a 6-element, 4-group lens with a 47° angle of coverage, while the other lenses in the line are 8-element, 4-group designs with 55° of coverage.
This is a list of products made by Mamiya, including cameras and lenses. Models made by Mamiya but marketed under other labels are shown in parentheses. Models made by Mamiya but marketed under other labels are shown in parentheses.
The ETX started out as a 90 mm (3-1/2") Maksutov Cassegrain telescope (first produced in 1996) and took advantage of high volume mass production and simplified optical and parts construction to open a new market for a cheap alternative to the very expensive Questar 3-1/2 Maksutov Cassegrain [1] [2] The ETX "line" has been expanded to 105 mm, and 125 mm Maksutov Cassegrains and achromatic ...
The Cooke triplet is a photographic lens designed and patented in 1893 by Dennis Taylor who was employed as chief engineer by T. Cooke & Sons of York. It was the first lens system that allowed the elimination of most of the optical distortion or aberration at the outer edge of the image.
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