Decent zoom. Now I use it only for reporting (registry office, banquet). Loses even to budget fixes in terms of sharpness and bokeh. Hole 4 is clearly a bit dark (when compared even with the same 50 f/1.8), but at the same time it is functional and sharp up to 70 mm inclusive. The trunk leaves, so the dust sucks a little (but not much). I recommend it to amateurs and novice pros as a staff member, despite the fact that the price does not bite. If you have money, then it is better to prefer 24-70 f / 2.8 to him, this is especially true for the pros. After switching to other glasses, you will remember 24-105 without much enthusiasm. In general, average optics, but a budget Elka :) Do not use it for shooting portraits, because the bokeh is not ice, and it is soapy at a long focus (from 70 mm) with an open hole. If finances are not very good, take fifty kopecks for 3 thousand in addition to it and make portraits on it.
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