My reasoning for buying a slightly larger telephoto lens led me to the Canon EF L IS USM 4/300 or the EF 4.5-5.6 / 100-400mm L IS USM. I use the Canon EF 4 / 70-200mm L IS USM for quite some time and am using their services more than satisfied. It took a while, but then it was but the zoom of Canon. Making a purchase, which I have no regrets. Since I already had a lens in this zoom range, but was bitterly disappointed by brilliance, handling and sharpness, only one stock could be considered. While it is difficult and with camera to get quickly to 2.5 kg at the man, but it is comfortably in the hand, autofocus and image stabilizer working quickly and quietly, and if you put less emphasis on a low f-number, then the hit rate very good. It is also good that you can remove the tripod adapter quickly (interferes with freehand pictures yet) and you can set the Close limit the distance setting means switches between 1.8 and 6.5 m. With the help of a rotating ring on the lens can be the "slippage" of the zoom prevent (a sliding zoom). The first pictures were quick in the box and I'm satisfied. Even at full aperture, the sharpness is good and the stopping down by one level, it brings even better. A very good choice.
