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Ecut 6 macro8/30/2023 Mine is the built in motor version, which focusses a bit slowly, but accurately. I bought this lens about 18 months ago for use on my Nikon D80. Distortion and shading are quite similar between the two optics, so the Tamron probably gets the overall nod for its combination of lower price, longer focal length range, and somewhat better sharpness from 180-300mm. Chromatic aberration is roughly similar on both lenses, although the Canon does noticeably better in the middle of its focal length range. (It was one of the first lenses we tested, before we began using the EOS-5D for full-frame tests.) It's actually quite close to the Tamron unit's performance in many areas, although the Tamron is a fair bit sharper, even at 300mm than the Canon is at 200mm. Priced slightly higher than the Tamron 70-300mm the Canon EF 55-200mm f/4.5-5.6 II USM is also a full-frame lens, although we only tested it on a sub-frame body. The lenses most Canon or Nikon DSLR owners will probably consider against this Tamron model are the 55-200mm lenses from the respective camera makers. As of this writing (early February, 2007), we haven't tested any lenses in this focal length range from the camera manufacturers, nor any competing models in the same price bracket from other third-party manufacturers.
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