Really fast focusing, but unfortunately periodically misses - if the aperture is 1.8, then this is eventually visible and the miss is about 20% in difficult cases. The issue is being resolved - by double focusing, focusing - release the button, focus again. Since the focusing itself is very fast, there are no questions here, and the problem really pops up in difficult cases, when it is already dark, but the camera did not turn on the autofocus backlight. Other than that, I'm very pleased with the lens. I chose between it and 50mm, I settled on 35mm, because for my taste fifty dollars is not that neither :)
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