Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A GREAT Lens......PERIOD!

I bought this lens on a lark, and have enjoyed every second of my time owning it. I use it on my Canon 5D and on my Canon 40D, if I set my shots correctly, I have some of the most unusual, attractive and impressive shots in my Shot Library.The key to success with this lens is to set the shot correctly. I have found it takes more planning, a steadier hand (or Tripod/Monopod), than even my 100-400MM F/4-5.6L. With a telephoto lens, your area of focus is less a challenge than the 180 Degree worth of study when dealing with this lens.Don't get me wrong, this lens is FUN!! I've never enjoyed landscapes, portraits, artistic shots more than I have when I am using my 15MM Fish. For the Casual user, high end amateur, or for the seasoned professional, this lens is an inexpensive TOOL each of us should have to round out our lens bag. BUY IT!!