Why now exactly superlative "best" in this telephoto zoom focal length range?
- Picture quality: sharp images, high resolution, colors are beautifully reproduced (Scan only in RAW)
- AF: Autofocus is fast and accurate. If the latter is not the case, you should contact Canon for the purpose of adjusting (was not necessary for me)
- Processing: beyond all doubt. Man holding a proper armor in his hand. Splash proof that part is still (just brings something, even though the camera is protected, for example, 7D)
Conclusion: Of course, this lens is expensive, no question. It is too heavy for one or the other and clunky (about 1.6 kg). But who refuses to compromise, can not ignore this message. Alternatively still remain the 4.0 / 70-200 IS, which is fainter, but more compact, lighter, and cheaper. But even with excellent image quality. It is perhaps succumbed to the 4.0er version 90% of all situations; Who even wants to take home the remaining 10%, the need 2.8er zoom. Who additionally buys even the 2x converter III (Version III, not II), will be rewarded with a 5.6 / 140-400 IS Zoom with a still stunning image quality, which is not possible with the 4.0er Tele (Aperture 8.0 , AF only possible with 1er Bodies). Also, the AF remains despite Converter yet quickly and accurately (as I said, is only valid for the converter III version, the older version is slightly weaker in this regard). I've even seen sample images that have been shot with this lens and 2 successively used 2x converters (2x II + 2x III). The images were still incredibly hot! PS: The new converter III can no longer connect in succession, but Version II Version III is plus.
For users faster cameras (quickly, in accordance with the AF-speed), maybe a useful hint: often there is criticism that pictures do not quite sharp arise (not explicitly with this lens, but in general). One possible reason for this could be the latency time of the IC module. Means the AF camera reports "focus", but while the IC module is still settling. So is dissolved in such a situation quickly, it could lead to blurry images because the IC module was not quite ready. In such situations, it helps after half pressing the shutter button half a second to wait before triggering. For cameras with rather "slower" AF (eg 5D I), this problem might not even occur, because the IS is often faster than the AF. However, the 7D has a fast AF, which is why this phenomenon actually occurs (itself tested). This should then also apply to the 1 Series.
