Pixalo Photography Community - View Single Post - Sigma 70-300 APO DG + 28-300mm

SammyC · 17-02-2006, 08:58

Well I had a look here at your 55-200 so it sounds like its not a proper ring USM but a micro USM.

Sigma will still not compete speed of focus-wise but will probably be sharper.

17-02-2006, 08:58	#5 (permalink)
SammyC Forum Regular Join Date: Jul 2005 Location: Bristol Posts: 1,466	Well I had a look here at your 55-200 so it sounds like its not a proper ring USM but a micro USM. Sigma will still not compete speed of focus-wise but will probably be sharper.