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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.
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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.
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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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Rafael Grossi, head of the IAEA, told Reuters on Friday that Iran was accelerating its enrichment of uranium to up to 60% purity, approaching the about 90% level that is weapons grade.
The Fotodiox LM-NKZ-PRN is another autofocus Leica M to Z adapter. [117] The Megadap MTZ11 contains a focusing helicoid with 6.5 mm of extension which is used for autofocus. This range is sufficient to cover the full focusing range of lenses up to around 50 mm focal length. [118]