Very weak lens. It knocks down the geometry, after which it is difficult to straighten it in the converter, so you need to shoot it taking into account future edits, because part of the image is cropped. In the open, the sharpness is normal, not ringing. From 4 onwards it is very sharp. A very ambiguous lens is obtained because of this. It is very difficult to shoot architecture or interiors on it because of the blockages. Good for landscapes. Nested photos - the first 2 with the correction of perspective, the remaining 4 only converted from Rav. I put a clear C mark, I will use it only for landscapes on vacation, no more.
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