At the sliding clinic this weekend, I test out the Tamaron SP 150-600MM F/5-6.3 Di VC USD with my 5DMarkIII. Overall I'm impressed with this lens. For the money, its a nice lens to have in the bag. After the 400mm reach, I am seeing softness, but nothing that should be thrown out. Here are some action photos from the 8U - 16U girls sliding clinic, just to test the auto focus. A wee slower than my Canon monster lens, but I was also using my 5D which isn't really built for sports, but I've managed to use it for the last 2 years. Poor thing. It does want to retire to portraits, just waiting for my budget to increase... anyway, enjoy the photos. Don't they look good sliding???!!!!