Canon USM vs Non-USM Focus Accuracey

Discussion in 'Canon' started by Edward Holt, May 20, 2006.

  1. Edward Holt

    Edward Holt Guest

    I've got a Canon 50mm f1.8 mk2 and a 28mm f2.8 which are both non-USM.
    I seem to have hit and a miss focusing accuracy with them.

    I've also got a 20mm f2.8 which is a USM and have no problems with the

    Are the non-USM focusing lenses less accurate than the USM versions?

    I'm thinking of replacing the 50mm and the 28mm with the bigger aperture and
    more expensive USM focal length equivalents.
    Edward Holt, May 20, 2006
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