Extremely high quality optical lens. 10 out of 10. Bravo! The mechanics came out well. The finish / alignment came out very badly. Focusing physics, not like Zeiss or Nikkor (old / new), u37 or industrial, where everything is clear on the thread / guides. A millimeter step back and forth is a noticeable difference. Here, the lens block has an uncomfortable backlash / goes skidding, when turning the ring 1-2mm left and right to adjust. If in the city you can focus on frosted glass or picking (at f4-8), then shooting portraits in the open is really a roulette, only focus bracketing or an eagle eye. A good trainer for the head and eyes. Disappointed in his ability to focus on 1.4 through the keyhole d700 Nikon D700
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