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Leica III or IIIa with 250-image magazines (10 metres of film) Leica G (Leica IIIa) 1935–1940: adds 1/1000 speed: Leica IIIb: 1938–1940: Rangefinder and view windows closer together: Leica IIIc: 1940–1951: die-cast body, slightly longer, redesigned shutter featuring ball bearings: Leica IIId: 1940–1945: Very rare, only 427 were built ...
V Vision (unaided) VA Visual acuity VA Dcc - VA Dsc Visual acuity with Distant chart with correctors Visual acuity with eye chart at Distant 20 feet (6 m) and with (cc: Latin cum correctore) correctors (spectacles); Dsc is without (sc: Latin sine correctore) correctors. See Visual_acuity#Legal_definitions: VA Nsc - VA Ncc
The Leica copies originate from the Leica camera that was launched by Ernst Leitz, Wetzlar in 1925, using the Leica 39mm screw mount of 26 threads per inch (25.4 mm), and the standard 35mm film. The design was carried out by Oskar Barnack , beginning in 1913 by building a camera for 24×36 mm negatives that by now is called the Ur-Leica, or ...
An eye chart is a chart used to measure visual acuity comprising lines of optotypes in ranges of sizes. Optotypes are the letters or symbols shown on an eye chart. [ 1 ] Eye charts are often used by health care professionals, such as optometrists , physicians and nurses , to screen persons for vision impairment .
The Leica II is a Barnack rangefinder camera introduced by Leica in 1932. They were the first Leica cameras with a built-in rangefinder. Several models were produced over the years, in parallel with the Leica III series from 1933. The Leica II uses a coupled rangefinder distinct from the viewfinder. The viewfinder is set for a 50 mm lens; use ...
The Leica R4 (1980) and Leica SL2 MOT (1974) The Leica Visoflex II (1960) Leica's answer to the SLR: a Leica Visoflex II on Leica IIIf. From 1964, Leica produced a series of single-lens reflex cameras, beginning with the Leicaflex, followed by the Leicaflex SL, the Leicaflex SL2, and then the R series from R3 to R7, made in collaboration with ...
If you've been on social media (especially TikTok) even a little recently, you've probably seen an ad for Pair Eyewear. While other glasses-by-mail companies compete largely on price, Pair is all ...
The largest letter on an eye chart often represents an acuity of 6/60 (20/200), the value that is considered "legally blind" in the US. Many individuals with high myopia cannot read the large E without glasses, but can read the 6/6 (20/20) line or 6/4.5 (20/15) line with glasses. By contrast, legally blind individuals have a visual acuity of 6/ ...