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  2. Leica III - Wikipedia

    en.wikipedia.org/wiki/Leica_III

    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 ...

  3. List of optometric abbreviations - Wikipedia

    en.wikipedia.org/wiki/List_of_optometric...

    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

  4. Leica II - Wikipedia

    en.wikipedia.org/wiki/Leica_II

    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 ...

  5. Eye chart - Wikipedia

    en.wikipedia.org/wiki/Eye_chart

    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 .

  6. List of Leica Camera models - Wikipedia

    en.wikipedia.org/wiki/List_of_Leica_Camera_models

    Leica Q (Type 116) compact full frame camera with a Summilux 28 mm f /1.7 ASPH lens was officially announced on June 10, 2015. [27] Its successor, the Leica Q2 with a 47.3 Megapixel full frame sensor, was launched in March 2019. In November 2020, the company released a monochrome version of the camera, the Q2 Monochrom, using a sensor similar ...

  7. M39 lens mount - Wikipedia

    en.wikipedia.org/wiki/M39_lens_mount

    Detail of the mounting of a Leica IIIf. Currently, Cosina in Japan — many of whose recent products are marketed under the Voigtländer brand — and FED in Ukraine continue to produce camera bodies using a true Leica thread-mount. These give amateurs the rare chance of having a very professional camera by combining a used Leica lens with an ...

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