The 70-200 zoom L-series Canon are a must in their class, which remains to choose because they are available in several models. The more accessible price does not open until F4, evacuate immediately because the have available a constant F2.8 aperture is an undeniable advantage. The crux of the problem among 70/200 at F2.8 is whether to choose the stable version or not? In absolute terms I would say that the stable version provides a distinct advantage for the professionals and the question does not even arise but for fans like me still poses the very high additional cost of the problem of stabilized version because Canon n ' there will no punches! It takes 1,000 uros more, or almost double and even if one falls back to the older generation, it's still about 600 uros the extra cost and there I still find that Canon exaggerating. In practice it depends on the case with which you use it, for my part I associate it with the EOS 5D MkII and high image quality even at high ISO speed allows me to do without the stabilized release. Indeed, we can safely and without degrading the image quality raise the ISO speed, this allows a very fast exposure time and eliminate any risk of motion blur. Now if a longer exposure time is required by the circumstances of the shooting or the intended effect it is obvious that the tripod will be required but I would answer this objection, on the one hand, there is strong bet that even with the stabilized version of the use of the tripod will be necessary and, on the other hand, if one wants to sérieursement of the photo, invest in a tripod is not really a problem. After 15 days of intensive use and many photos taken at night on the occasion of shows, I can only note the high quality of the product and the absence of stabilizer was not a problem. In conclusion, the Canon EF 70-200 2.8L seems to be a good compromise for an amateur with a powerful case.
