IF stands for Inner focusing, in otherwords the focusing mechanism is inside the lens the front of the lens does not rotate, I'm pretty sure its the same lens though, that is, Wherever you saw the lens discribed with 'IF' could of been a mistake on the part of the person/s /retailer /website as there is no lens on the sigma website of that name
Last edited by Ant; 22-10-07 at 18:48.
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