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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.
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:
Many macro lenses are characterised by a high amount of chromatic aberration, especially when using reversed-lens, extension tube or close-up lens. Some macro lenses, called apochromatic lenses , are designed to better control this, such as the Laowa 100mm f/2.8 2x Ultra Macro APO and the Sigma APO MACRO 150mm F2.8.
A ceasefire between Turkey and the U.S.-backed Kurdish Syrian forces (SDF) around the northern Syrian city of Manbij has been extended until the end of this week, State Department spokesperson ...
You can watch Thursday Night Football: Packers vs. Lions at 8:20 p.m. ET/5:20 p.m. PT on Amazon Prime Video. Thursday Night Football returns to its island-game normalcy tonight after a turkey ...
Nick Cannon is getting candid about his mental health journey. Earlier this month, the Masked Singer host, 44, shared he had been diagnosed with narcissistic personality disorder.For the star ...
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The U.S. Food and Drug Administration (FDA) now classifies eggs as a “healthy, nutrient-dense" food, according to a new proposed rule. Registered dietitians react to the change.
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