Its a good lens, does its job cheaply. Price/quality better than original Canon ones! Good fit, lightweight, good images. The autofocus isnt the best, takes a while to focus. And in that mode i got a few error codes which leaves me thinking that the quality of the cable that connects to the circuit board isnt the best. Anyway, if it doesn't get worse, it's just something to live with when thinking about the price. Its plasticky, which explains it's lightness, so its advised to keep it well conditioned and stored. For studio use, it's been great!