Splendid !!

For less than 1500 .. Pardon, for much cheaper than Nikon or Canon, you have a goal of a quality and impeccable finish !! Works perfectly on my D3100, whether MASP or what you want !! It is not clear and I was rather surprised, but despite the aperture ring, aperture is controlled by the camera! Moreover, the objective having a processor, exposure measurements are perfect.
In use, the focus ring offers some resistance but remains extremely fluid, there is no accoup when initiating the rotation of the ring, metal construction provides an impressive weight to the objective and strengthens the impression of solidity and quality.
Only small default, permettants buttons to manipulate the cap before creating a small light on the cap, and I fear that dust does happen when the goal out of the bag. Anyway I probably spend more time cleaning the Nikon which is 5 times more than this one !!
In short, I highly recommend to anyone who wants a bright UGA and of very good quality !!