03-18-2011, 11:59 AM
What you showed us was a comparison of two different camera (which is fine) with two different lenses (which is not fine).
Sony 70-200G:
"It is fast (although not as fast as in the Zeiss ZA 24-70mm f/2.8), near silent and very accurate. "
Canon 70-200/4L IS:
"The lens features a ring-type USM drive resulting in a near silent and very fast AF."
"fast" vs "very fast" just to highlight the important words here. That's a subjective comment to some degree but obviously yours does also qualify as such.
A while ago we discussed internally how to come to a definitive conclusion regarding the DSLR AF capabilities. Technically you require identical lenses with identically capable lens firmware (which is already a no go) under identical lighting conditions (which means indoor).
The only relatively meaningful lens for a more formal test would be a Sigma 70-200/2.8 HSM II which is available on all platforms.
Regarding the indoor test scene - our discussion ended when considering taking pictures of a Merklin train approaching the camera. :-)) Technically this may be even fine to some degree though. However, we dropped the idea because it isn't really reflecting a typical field scene which would be a point of criticism, of course.
In our opinion such burst shot comparisons are a waste of resources because you can't keep the set of parameters valid enough.
Sony 70-200G:
"It is fast (although not as fast as in the Zeiss ZA 24-70mm f/2.8), near silent and very accurate. "
Canon 70-200/4L IS:
"The lens features a ring-type USM drive resulting in a near silent and very fast AF."
"fast" vs "very fast" just to highlight the important words here. That's a subjective comment to some degree but obviously yours does also qualify as such.
A while ago we discussed internally how to come to a definitive conclusion regarding the DSLR AF capabilities. Technically you require identical lenses with identically capable lens firmware (which is already a no go) under identical lighting conditions (which means indoor).
The only relatively meaningful lens for a more formal test would be a Sigma 70-200/2.8 HSM II which is available on all platforms.
Regarding the indoor test scene - our discussion ended when considering taking pictures of a Merklin train approaching the camera. :-)) Technically this may be even fine to some degree though. However, we dropped the idea because it isn't really reflecting a typical field scene which would be a point of criticism, of course.
In our opinion such burst shot comparisons are a waste of resources because you can't keep the set of parameters valid enough.