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03/06/2009 12:38:09 PM · #1 |
I am trying to understand the text in the description of a lens
Example: Canon EF 50mm f/1.4 USM AF
I am trying to find out what:
EF=?
USM=?
AF=? (I assume that means auto focus)
I see a few variations for a 50mm lens. I know some might be an older generation of that lens. Also variations showing IS (image stabilazation). Just what to be sure of what I am buying. Don't want to miss something.
Thanks, |
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03/06/2009 12:42:36 PM · #2 |
Casual reply:
• EF = lenses designed for digital bodies
• USM = Ultra Sonic Motor
• AF = Auto Focus
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03/06/2009 12:42:36 PM · #3 |
EF = Electro-Focus. It's the most common lens mounting system of Canon cameras (as opposed to the older FD and newer EF-S)
USM = Ultrasonic Motor. A quieter and smoother focusing motor than the cheaper micromotors.
AF = yes, that means Autofocus.
Message edited by author 2009-03-06 12:43:22. |
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03/06/2009 12:44:00 PM · #4 |
Here's a good link //photonotes.org/articles/beginner-faq/lenses.html
Here are quick answers
ef = electrofocus (nut of it being it will work on all cameras as opposed to ef-s which only works on crops)
usm = ultrasonic motor (the technology used to autofocus the lens)
af = yeah autofocus |
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03/06/2009 12:44:56 PM · #5 |
| I just executed a rare and noteworthy double-yanko. I am the man. |
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03/06/2009 12:51:20 PM · #6 |
| Thanks for the quick and most informative information! |
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