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I formerly owned a Canon 400 f4.0 DO lens, which was very disappointing in terms of sharpness. By comparison, the 300 f2.8 is simply a fantastic lens, which I have absolutely no hessitation in recommending. Although weighty, it can still be hand-held, and the speed and accuracy of focussing is amazing.
I have done several lens tests comparing this lens with all the other lenses I have, and it is the sharpest lens in the central area, and very close behind the 100mm macro and 50mm 1.8 in edge sharpness, which is incredible for such a relatively long lens.
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