Great experience buying the lens on Ebay, just as advertised & had EBay ins
11 December 2011
Summary: I had read about the sharpness of pictures with this lens, as well as the overall quality and did lots of studying before making such a large lens purchase. I can tell you, it is well worth it. I primarily photograph wildlife, and it is unsurpassed in my estimation. It is light enough to use without a tripod, and I've gotten some great pics of birds flying with it, as well as quick point & shoot opportunities.
Summary: This lens is everything that they say it is. It does take a little getting used to, although I have to admit most of my blown shots are in low light and/or using a 2x teleconverter. The one day (so far) I went out with lens only and bright sun, autofocus was over 90%. I did a test shot with the 2x tele and a tripod. Had to lock the mirror up even though I have a good tripod. Seems that even the expensive lens mounts have some vibration in them.
Summary: First and foremost, anyone who complains that this lens is heavy needs to get out and about more. Yes, it does weigh more than the 100mm Canon Macro, but I also have the Canon 500mm f4.0 lens & use it with a canon pro-body on a tripod and sometimes hand held but not for long. So, the Canon 300mm f2.8 weighs in a lot less than the 500mm and it can be hand held.