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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.
Macro photography (or photomacrography [1] [2] or macrography, [3] and sometimes macrophotography [4]) is extreme close-up photography, usually of very small subjects and living organisms like insects, in which the size of the subject in the photograph is greater than life-size (though macrophotography also refers to the art of making very ...
That distance is sometimes given on the filter in millimeters. A +3 close-up lens has a maximal working distance of 0.333 m or 333 mm. The magnification is the focal distance of the objective lens (f) divided by the focal distance of the close-up lens; i.e., the focal distance of the objective lens (in meters) multiplied by the diopter value (D) of the close-up lens:
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Amazon will continue shipping items until Dec. 24, but same-day delivery will be limited to select items; At Walmart, you can buy online and pick up in store until Dec. 24.
A news anchor for NBC News in Washington, D.C. is stepping away from the desk after a recent segment prompted concern from audiences. NBC4 News issued a statement on-air and on its website on ...
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