Made by Tokina. This lens is a bear. Thankfully, it has a tripod mount. It is impossible to hand hold. I've begun testing it with my T2i but I think it will produce better results on a mirrorless body. Critical focus is difficult to achieve on a D-slr. The lens is made very well. Zoom and focus rings are very smooth and well dampened, F-stops click nicely. It is reasonably sharp @ f4.5 and sharp at f8 thru the entire zoom range. Contrast is noticeably low and color rendition is a bit flat. Purple finging can be seen at 100% crop but well controlled. Bokeh is less distracting than many tele-zooms but it doesn't compare to the smoothness of a prime lens. This lens can be found for a very reasonable price. If you don't mind lugging it around and doing a little extra post-processing of your images it can produce good results.