Canon Zoom Telephoto EF 100-400mm f/4.5-5.6L IS (Image Stabilizer) USM Autofocus Lens

I have had this lens for several years now. It is a great piece of glass and the IS really works well. However, I will say this, and it may only be true for my copy, but it is soft in sharpness if shot at less than f8.0. I think it may be this way with all of them. But even with that draw back, it is still a super piece of glass. At f8.0, it is hard to find a sharper lens. With the IS, I can hand hold shots as slow as 1/60 sec at 400mm with consistent results.

It is the glass I grab if I'm birding or shooting any wildlife for that matter.