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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.
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.
Florida’s bowl chances are suddenly incredibly realistic after the Gators beat No. 22 LSU, 27-16. After LSU kicked a field goal to cut Florida’s lead to four with 5:18 to go, the Gators made ...
Oracle stock fell close to 7% on Tuesday, marking the steepest daily loss of the year, after second quarter results fell short of Wall Street analyst expectations and a forecast for artificial ...
Extension tube #1 - 11.8mm [14] Extension tube #2 - 23.6mm [14] Extension tube #3, Extension tube #3S - 35.4mm [14] Auto macro spacer 2x - when used with 80mm f/4 Macro lens, increases magnification from 1:2 to 1:1 [14] Auto bellows [14] Balloon bellows [14] Slide copier attachment and slide carriers [14] Focus handle (attaches to lens) [14]
Republican Sen. Lindsey Graham said Sunday that Pete Hegseth, President-elect Donald Trump’s pick for secretary of defense, promised to release the woman who accused him of sexual assault from a ...
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