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The Nikon F-mount is a type of interchangeable lens mount developed by Nikon for its 35mm format single-lens reflex cameras.The F-mount was first introduced on the Nikon F camera in 1959, and features a three-lug bayonet mount with a 44 mm throat and a flange to focal plane distance of 46.5 mm.
A mirrorless camera (sometimes referred to as a mirrorless interchangeable-lens camera, MILC, [1] or digital single-lens mirrorless, DSLM) is a digital camera which, in contrast to DSLRs, [2] does not use a mirror in order to ensure that the image presented to the photographer through the viewfinder is identical to that taken by the camera.
The double frame uplifting glasses have one moving frame with one pair of lenses and the basic fixed frame with another pair of lenses (optional), that are connected by four-bar linkage. For example, sun lenses could be easily lifted up and down while mixed with myopia lenses that always stay on.
A waist-level non-metered finder was available, as well as a non-metered pentaprism and three varieties of through-the-lens (TTL) metered prisms (CdS, PD and AE). The metered prisms read the aperture dial through a mechanical coupling on the lens. The standard lens was the 80mm f/2.8 C or the 70mm f/2.8 C E or the 80mm f/1.9 C. [4]
Lens glass etches easily from contact with oils or dust. [11] To secure the prisms of the lens a compound of calcium carbonate, lead, and linseed oil, called litharge, was used. If deterioration of the litharge is found, it is likely that the prisms are not properly secured within the frame structure of the lens. [4]
The strength of the prism is increased until the streak of the light passes through the centre of the prism, as the strength of the prism indicates the amount of deviation present. The Maddox rod is a handheld instrument composed of red parallel plano convex cylinder lens , which refracts light rays so that a point source of light is seen as a ...
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