I was looking at a Sigma lens and it had all the letter that I'm familiar with but it also had RF what does RF mean on a sigma lens.
BlackBart Member 241 posts Likes: 15 Joined Aug 2009 More info | Jun 29, 2013 17:21 | #1 I was looking at a Sigma lens and it had all the letter that I'm familiar with but it also had RF what does RF mean on a sigma lens.
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EvanIdler Goldmember  1,600 posts Likes: 4 Joined May 2005 Location: Edmonton, Alberta, Canada More info | Jun 29, 2013 17:40 | #2 I believe it means Rear Focusing. Canon5DIII + Some L + Some non L + Some Sigma + Some Tamron + other stuff....
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goldboughtrue Goldmember 1,857 posts Likes: 4 Joined Mar 2007 Location: Colorado More info | Jun 29, 2013 17:44 | #3  Permanent banThe above poster is correct - Rear Focus. I searched and went to this site http://www.pbase.com/goldbough
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Thanks' guys that was the only thing I could think of but since it is in the description I was not sure if it was for something else.
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