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The Micro Four Thirds system (MFT) of still and video cameras and lenses was released by Olympus and Panasonic in 2008; lenses built for MFT use a flange focal distance of 19.25 mm, covering an image sensor with dimensions 17.3 × 13.0 mm (21.6 mm diagonal).
Drawing showing the relative sizes of sensors used in most current digital cameras, relative to a 35mm film frame. The image sensor of Four Thirds and MFT measures 18 mm × 13.5 mm (22.5 mm diagonal), with an imaging area of 17.3 mm × 13.0 mm (21.63 mm diagonal), comparable to the frame size of 110 film. [4]
The first lens to carry the Rokkor designation was a 200mm f / 4.5 lens that came with the hand-holdable aerial camera Chiyoda SK-100 in 1940. [1] After the Rokkor name was dropped and no longer engraved in new lenses after 1980/1981, [1] the Rokkor name resurfaced two times.
Sigma has adapted 13 lenses for the Four Thirds System, ranging from 10 mm to 800 mm, including several for which no equivalent exists: the fast primes (30 mm f /1.4 and 50 mm f /1.4) and extreme telephoto (300–800 mm f / 5.6). As of 2014 all Sigma lenses for the Four Thirds System have been discontinued.
Zuiko (Japanese: ズイコー or 瑞光) is a brand of optical lenses [1] made by Olympus Corporation that was used up to and into the Four Thirds system era. The name Zuiko (瑞光) means 'Holy Light', using a character from the Mizuho Optic Research Laboratory (瑞穂光学研究所), where the lens was developed, and a character from Takachiho Corporation (高千穂製作所), which would ...
HCD lenses are optimized for slightly smaller image sensors covering 48×36 mm (1.9×1.4 in), [95] so the crop factor for HCD lenses is slightly greater at 0.72. With these sensors, an 80 mm lens would have the equivalent coverage of a lens with a focal length of approximately 60 mm on a "full-frame" camera.
Ratio of the reference frame's diagonal (35 mm format) to the diagonal of the image sensor in question (Fujifilm GFX): + () + () As of September 2023 there are 32 lenses available for the G-mount (excluding the as yet unreleased model "Power Zoom Lens"); 19 from Fujifilm's Fujinon brand and 13 from third party companies.
Helios-44M lenses have been produced at KMZ since 1971, and the main differences from the base model Helios-44 concern only the aperture control method, the number of aperture blades and the resolution of the lens: - Helios-44M has an 8-blade diaphragm; - Helios-44M has a jumping diaphragm device, unlike Helios-44, which has only manual control ...
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