The 100-400 is actually a good friends lens, but we share freely. I
have used it quite a bit and do like it...but my problem is that it
isn't long enough for a lot of wildlife. I am thinking about maybe
gettting a 400 prime (f/5.6) that I could use with a teleconverter, but
am not sure I want that long of lens without the IS. Just something to
dream about, I guess. I do use a long lens quite a bit, and a wide
lens for landscapes. Not so much use in the middle. I need a good
long lens to pretty much fill my lens needs,but am in no rush. I would
like to see Canon update the 100-400 to the newer IS system....then I
would problably bite. Thanks again for telling me about this forum.