Bought to replace the regular 22mm. Because I shoot landscapes, then 22 mm is not enough. Of the shortcomings, perhaps, first of all, I will highlight the fact that there is no automatic sharpening to infinity when turned on - you have to do it manually every time. From 22 it was easier - turned it on and shoot right away. I will also say that automatic focusing led to the fact that many shots were unusable - sharpness was almost absent on the left side of the picture closer to the edge. Because of this, only manually and, moreover, on the left edge. The latter is mandatory - it's the only way to avoid the soap on the left. Then the picture is perfectly sharp from edge to edge. But the process turns out to be long - turning on, bringing the lens to its working position, removing the cover, manual focusing. For me, this is the only real downside.