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Elmar lenses have a maximum aperture ranging between f/2.8 and f/4. Current Elmar lenses have a maximum aperture of f/3.8 or f/4, as in the Elmar-M 24 mm f/3.8 and Tri-Elmar-M 16-18-21 mm f/4. [ 1 ] The term Elmar is sometimes combined with: Super, Tele, APO, Macro or Vario.
The front element of the Tessar can be replaced to make a long-focus or wide-angle lens. In 1957 Carl Zeiss offered the long-focus Pro Tessar 115 mm f/4 and 85 mm f/4, and the wide-angle Pro Tessar 35 mm f/3,2 for use on the central-shutter SLR Zeiss Ikon Contaflex Super B cameras.
The Leica Vario-Elmarit-SL 24-90mm F2.8-4 ASPH is an interchangeable standard zoom lens for Leica L mount, announced by Leica on October 20, 2015. [1]A review in PCMag UK praised the lens for its sharpness, low distortion and weatherproof, optically stabilised design, while also drawing attention to its vignetting of up to 5.5 stops at 24mm.
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 90 mm gun M1/M2/M3 was an American heavy anti-aircraft and anti-tank gun, playing a role similar to the German 8.8cm Flak 18.It had a 3.5 in (90 mm) diameter bore, and a 50 caliber barrel, giving it a length of 15 ft (4.6 m).
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The M67 recoilless rifle is a 90 mm (3.55 inch) anti-tank recoilless rifle made in the United States and later in South Korea.It could also be employed in an anti-personnel role with the use of the M590 antipersonnel round.
9 lb (4.1 kg) Short version 8 lb 6 oz (3.8 kg) Length: Long version: 48 in (1,200 mm) Short version 40 in (1,000 mm) Barrel length: Long version: 30 in (760 mm)