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Astro-Physics, Inc. is a manufacturer of amateur telescopes, mounts, and accessories.Founded in 1975 by former Sundstrand Corporation engineer Roland Christen, [1] the company is noted for its line of apochromatic refractors as well as high-end mounts.
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 ...
A Cooke triplet (3-element, 3-group) design with a minimum aperture of f/22. 35 mm f/4.0 with a minimum aperture of f/22. Lens is the same as Curtagon version, only serial numbers are earlier.
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The Mamiya 645 Pro (discontinued) was manufactured from 1993 to 1998 — minor updates to the Mamiya 645 Super; The Mamiya 645 Pro-TL (discontinued) was first released in 1997 — minor updates to the Mamiya 645 Pro; The Mamiya 645E (discontinued) was first released in 2000 — entry-level model with a non-interchangeable back and finder
The Voigtlander 90mm F3.5 APO-Lanthar SL II is an interchangeable camera lens announced by Voigtlander on February 17, 2010. References
There is a similar effect on the depth of field of a particular aperture, so a 90mm f /3.5 lens on the RB67 is equivalent to using a 45mm f /1.8 on 35mm full frame. In 1975 Mamiya started to offer the M645 , the first SLR medium format camera to use the 645 format exclusively.
First workshop of Carl Zeiss in the center of Jena, c. 1847 Carl Zeiss Jena (1910) One of the Stasi's cameras with the special SO-3.5.1 (5/17mm) lens developed by Carl Zeiss, a so-called "needle eye lens", for shooting through keyholes or holes down to 1 mm in diameter 2 historical lenses of Carl Zeiss, Nr. 145077 and Nr. 145078, Tessar 1:4,5 F=5,5cm DRP 142294 (produced before 1910) Carl ...
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