EF 75-300mm f/4-5.6 IS Ultrasonic Lens

This is the older version of this lens (the newer one is a 70-300), I have had it for about a year and use it mostly for aviation photography. It is quick and accurate on focusing, and stays sharp well into the 200mm range, but does go a little soft as you get closer to 300mm. I have used the IS feature a few times in low light situations such as my brother's graduation, and while I am glad I have it I have learned not to rely on it too much as it only improves camera shake by two stops. There are only two complaints, this is a heavy piece of glass and can take it's toll on your neck if you have it mounted to an EOS-1 or EOS-3 even with out the booster. My other complaint is that this lens is a "creeper" if you have it hanging from a strap the lense can bee pulled from 75mm to the 100mm position by its own wieght. Even with these two concerns, it is a great lens and worth every penny.