In general, a good lens, but you need to be aware of the curvature of the field and constantly take it into account before taking a picture. Has pros: 1. Sharp, even at the edges with open apertures. 2. Lightweight, compact. 3. Price Cons: 1. The curvature of the field, this aberration is often not written about in Internet tests and in general most of the users who own it do not know about it, but it is here and it is very large. 2. No distance scale and convenient focus ring 3. Chromatic aberrations, in some situations they are very visible. 4. On small megapixel cameras, a "ladder" appears in the photographs (it is very noticeable on the edges of the branches).