I use this lens for several months and I get very good results by coupling it with a Canon EOS 5D Mark II. My photos taken in the mountains are excellent. Lately I've photographed Cagnes sur mer Horse racing and I was able to make excellent prints by cropping some of the view taken on the horses without loss of quality. Obviously there is a bit heavy but it is of robust construction, however, a support is not necessary, it is well stabilized.