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  2. List of Mamiya products - Wikipedia

    en.wikipedia.org/wiki/List_of_Mamiya_products

    Mamiya Automatic 35 EEF (Tower 39, Tower 41) (1961) — zone focus system. Mamiya EE Merit (Honeywell Electric Eye) (1962) — zone focus system. Mamiya 135 EF (1979) — zone focus system. Mamiya 135 AF (1980) — auto-focus. Mamiya U (1981) — zone focus system. Mamiya 135 EF2 (1982) — zone focus system.

  3. Canon EF-S 17–55mm lens - Wikipedia

    en.wikipedia.org/wiki/Canon_EF-S_17–55mm_lens

    Reception Praise. It is praised as "one of the best general/multi-purpose lenses available", and ideal for available light photography on a Canon APS-C camera. The fast f / 2.8 aperture, combined with 3-stop image stabilization, makes the 17–55 very useful in low light compared to an unstabilized f / 3.5–5.6 Canon EF-S 18–55mm lens, which is a frequent kit lens, and thus the 17–55 is ...

  4. Varilux - Wikipedia

    en.wikipedia.org/wiki/Varilux

    Varilux is a brand name belonging to Essilor International, a producer of corrective lenses. The first version of the lens was invented by Bernard Maitenaz and released in 1959, and was the first modern progressive lens to correct presbyopia. The progressive lens is characterized by correcting near, intermediate and far vision.

  5. Olympus E-500 - Wikipedia

    en.wikipedia.org/wiki/Olympus_E-500

    Body plus 17.5–45 mm and 40–150 mm Zuiko Digital lenses (Costco in-store package) The successor to the E-500 is the E-510 . Released in 2007, the E-510 provides several feature improvements including a new 10-megapixel Live MOS Sensor with claimed lower image noise at high ISO compared to the E-500, LiveView and in-body Image Stabilization ...

  6. Progressive lens - Wikipedia

    en.wikipedia.org/wiki/Progressive_lens

    Progressive lenses are corrective lenses used in eyeglasses to correct presbyopia and other disorders of accommodation. They are characterised by a gradient of increasing lens power, added to the wearer's correction for the other refractive errors. The gradient starts at the wearer's distance prescription at the top of the lens and reaches a ...

  7. Base curve radius - Wikipedia

    en.wikipedia.org/wiki/Base_curve_radius

    Base curve radius, or simply base curve, abbreviated BCR or BC, is the measure of an important parameter of a lens in optometry. On a spectacle lens, it is the flatter curvature of the front surface. On a contact lens it is the curvature of the back surface and is sometimes referred to as the back central optic radius (abbreviated BCOR ).

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