I have used many Sony lens and this one has the most build of lens elements in the design. Having used cameras for over fifty years you know when a product gives good quality images without fudging them as I say. I am one of the old school photographers where the photo you took had to be spot on so maybe twenty photos one would be the right one this was on film and that cost money where as now if I take fifty shots it does not matter . So I have only had the lens for a few hours but in that time got the feel of the weight and operation of the lens, while normally within the first hour I would have taken around thirty photos this exercise was only 20 over the twenty shots my main goal is perfection of all the colours and in focus sharpness must be spot on. I check on what colours I am photographing against the actual subjects while they are still there to see. So the lens operates as I would expect it smooth and precise when I am out and about sometime there is no second chance esp