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Extension tubes are sometimes confused with teleconverters, an optical component (i.e., containing lenses) designed to increase effective focal length. A close-up lens also enables focusing closer for macro photography but, unlike an extension tube, a close-up lens actually is an optical element.
The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.
Male mount of Minolta MC-Rokkor 58mm 1:1.4 lens with female lens mount of an Minolta XD-7 Lenses sold per year by mount type. A lens mount is an interface – mechanical and often also electrical – between a photographic camera body and a lens.
A teleconverter works similarly to a telephoto group of a proper telephoto lens.It consists of a group of lenses which together act as a single diverging lens. The location of a teleconverter is such that the image produced by the lens is located behind the teleconverter in a distance smaller than its focal length.
Combinations: C, CS and extension adapter; Camera body Extension tube adapter Lens Net effect Focus View angle Zoom Exposure C C Normal Normal Normal Normal C CS +5 mm Near-sighted Narrower Larger Darker C 5.0 mm (0.20 in) C +5 mm Near-sighted Narrower Larger Darker C 5.0 mm (0.20 in) CS +10 mm Most near-sighted Narrowest Largest Darkest CS C
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Extending the distance between the lens and the film or sensor, by inserting either extension tubes or a continuously adjustable bellows, is another equipment option for macro photography. The further the lens is from the film or sensor, the closer the focusing distance, the greater the magnification, and the darker the image given the same ...
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