By and large - glass is about nothing. Tried 3 different instances. All three never impressed, causing only misunderstanding already at the trial stage. OK, I attributed it to the curvature of my hands. Bought. Walked for a couple of days. Submitted for examination. Received confirmation of all "questions" (read below). Took the money. Not worth your money under any sauce. At all. The stub works extremely strange: on frames one after another, the sharpness along the edge can be very different. That is, with a working stub, the lenses can "get up" as you like. It does not give sharpness along the edge (comparable to the center) on any aperture. Skewed sharpness between the left and right edges, changing with different focal lengths. Language does not turn to recommend this misunderstanding to anyone. No, if you belong to the category of "money don't peck" - "dangle" - "aesthetic element" and the like, then it's not a question, buy it. If you need to shoot - I strongly advise against it. A significantly cheaper combination of three Art from Sigma (19-30-60) will give much better results.
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