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Jul 1, 2017 at 20:13 history edited Michael C CC BY-SA 3.0
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Apr 13, 2017 at 12:43 history edited CommunityBot
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Jul 8, 2016 at 3:49 history edited Michael C CC BY-SA 3.0
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Jan 20, 2014 at 8:43 history edited Michael C CC BY-SA 3.0
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Jun 17, 2013 at 18:44 history post merged (destination)
Jun 16, 2013 at 11:52 comment added Michael C Most Canon primes are USM. All of the USM lenses have FTM focus, and most, if not all, of the micro-USM are FTM focus as well. Canon currently offers 37 lenses in fixed focal lengths. 28 are designated USM. Of the remaining 9, 4 are TS-E tilt/shift lenses that have no AF, and a fifth is the 65mm 1-5x Macro that is also manual focus only. The remaining 4 include the 40mm STM that has FTM focus-by-wire. So only the 15mm fisheye, the 50mm f/1.8, and the 50mm f/2.5 Macro have AF and are not USM lenses.
Jun 16, 2013 at 11:30 comment added DetlevCM "Most Canon prime lenses allow you to manually focus without switching off the AF." ?? No. Canon lenses with USM motors allow you to manually focus without switching off the AF. (And I think even there were one or two exceptions.)
Jun 16, 2013 at 10:30 history answered Michael C CC BY-SA 3.0