Judging by foreign reviews, where this glass is compared in sharpness with 24 / 1.4 gm, and it is not much inferior to it there, I came across an unsuccessful copy. I returned it to the store with a claim for quality, after three weeks the manufacturer approved the return, and returned the money, although I asked for a lens with uniform sharpness. But since I live in a not very big city, you can buy a subject only with delivery from other cities, and it is not possible to determine the problem upon receipt. you need a large space for infinity, and so far there is no particular need for it, I decided to wait for other reviews, maybe you can still find a good copy
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