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A quick peek at the barrel of your camera's lens reveals a jungle of letters, numbers, and acronyms.
Feb 19, 2016 · Canon's Nano USM focusing motors have so far been used in the EF 18-135mm f/3.5-5.6 IS USM and EF 70-300mm f/4-5.6 IS II USM lenses. It is a type of AF motor that, like Ring USM, uses micro-piezo vibrations to move the lens focus elements.
Jul 16, 2010 · There's the original "XYZ f/1.2.3" lens and then a later "XYZ f/1.2.3 II" lens if the lens has the same focal length (s), maximum aperture (s), and AF type. There's the original EOS xxxxD camera body and then a subsequent xxxxD Mark II camera body.
Nov 10, 2011 · What does this mean, and why or why do I not want it? USM uses Ultrasonic wave to move the lens quicker to achieve more precise focusing. Unlike the traditional old fashion magnetic lens, USM is quieter and less friction during the lens movement, thus it does not waste energy/battery by creating human audible noise.
May 2, 2022 · What do all those different numbers, letters & symbols on your camera lens mean? Find out here, in this EASY to understand guide to camera lenses.
The side by side comparison tool lets you easily view the specifications of two or more lenses. Choose the lenses from the list of the left then press compare. The results will be displayed in a new window, so please make sure that you temporarily disable any popup blockers that you may have. Include discontinued.
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Sep 30, 2004 · For instance the 75-300 USM has three versions. There is the oldest 75-300 f/4-5.6 USM that came out in 1992, then there is the 75-300mm f/4-5.6 USM II that came out in 1995 and finally there is the current 75-300mm f/4-5.6 USM III that came out in 1999. All three lenses use the same micro-USM.
