I tried before this sigma, tamrons with similar focal lengths. Everyone had their shortcomings, but there was no money for this lens. The only thing that was pleasing was the presence of a canon 50mm / 1.4, which worked quickly, hit accurately and produced an excellent sharp picture. I decided and sold all the lenses at once. This one waited 3 weeks (they ended abruptly in all warehouses). Finally, I waited for him and the first thing that surprised me was his size and weight for such focal lengths. The 50D, with its battery pack, flash, and this lens, has become too much for my wife to carry. From the first frames, evaluate the work of the stabilizer at low shutter speeds and 55th end. Focusing speed cannot be compared with an ultrasonic sigma motor, and even more so with a conventional tamron motor. Focusing misses are several times less than on sigmas and tamrons. Hole 2.8 really working. I didn’t even have to align this lens (although there is an in-camera adjustment in the carcass). In general, not disappointed with the lens, probably really the best for crop. The sharpness is not inferior to 50mm 1.4. If there are means and forces to move it. then take it and do not think, it is enough for almost all scenes from landscape to portrait.
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