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Lenses

Lenses

A camera lens (also known as photographic lens or photographic objective) is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically.

There is no major difference in principle between a lens used for a still camera, a video camera, a telescope, a microscope, or other apparatus, but the detailed design and construction are different. A lens might be permanently fixed to a camera, or it might be interchangeable with lenses of different focal lengths, apertures, and other properties.

https://en.wikipedia.org/wiki/Camera_lens

SIGMA 60-600mm F4.5-6.3 DG OS HSM
The Sigma 60-600mm F4.5-6.3 DG OS HSM Sports is the world’s first 10x optical zoom telephoto lens with a tele end of 600mm. Incorporating 25 elements in 19 groups, excellent and consistent image quality can be achieved throughout the entire zoom range. This lens’ intelligent OS featuring the latest algorithm delivers an image stabilization effect of 4 stops. Its optical design ensures maximum correction of magnification chromatic aberration encountered in hyper-telephoto shooting. This offers both high resolution and consistent edge-to-edge performance throughout the entire zoom range. In addi..
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CP+ 2019: Olympus shows super-tele zoom and 2.0 TC under glass
M.Zuiko Digital 2x Teleconverter MC-20Also on show was a non-built-in teleconverter: the MC-20, which will be available in Summer 2019. This doubles the focal length of a lens it's attached to, but at the cost of 2 stops of light. The MC-20 can be used with 150-400mm F4.5 TC1.25x IS PRO as well as the existing M.Zuiko Digital ED 300mm F4.0 IS PRO and M.Zuiko Digital ED 40-150mm F2.8 PRO.Combined with the forthcoming zoom and its internal teleconverter, we believe you'd get a 375-1000mm F11 lens (equivalent to a 750-2000mm F22 lens on full frame). Though the combination seems rather specialist...
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