This lens is absolutely amazing! My only regret is not purchasing it sooner. The reach, image quality, and focus speed are outstanding. It hardly ever leaves my camera now. There’s no noticeable drop in sharpness across the focal range—it's tack-sharp from 150mm to 400mm. The constant f/4.5 aperture is a real advantage, especially in changing light conditions. And if you need a little extra reach, the built-in 1.2x extender at your fingertips is an awesome feature.

This is an expensive lens, there's no doubt about it. But if you have the means to buy it, you won't regret it. It's extremely sharp, fast to focus, remarkably lightweight for its size and capability, and the handling is superb.

I regularly use this lens for sports photography and bird photography. Its so light weight and tack sharp. I love love love this lens!

Wanted this lens for quite some time and do not regret getting it. Weight to flexibility is great as I am not muscular. I have no problem carrying it around. Being a f/4.5 all the way through will allow me to use a lower ISO in dark locations. This lens will allow me to make better nature images and allow new ones.