I am surprised by the comments of some, how can weight be attributed to disadvantages? Focusing speed? This is not a reporter 24-105 which is made at the expense of quality tenacious and fast autofocus. This is glass for thoughtful, unhurried, staged photography. I set up 2-3 light sources, reflectors , I removed the model, looked at it, added backlight, removed the drawing one, etc. This is glass where you donβt need to shoot 8 frames per second, an object moving around the perimeter. This glass will give such a picture that more than one Canon glass will not. 24-70 and I sold my 70-300 after buying this. All the shades in RAV are especially noticeable, after converting to JPG everything turns pale for some reason.