« on: January 05, 2013, 05:38:04 PM »
Forgive my ignorance, I am quite new to photography. I would like to understand how the 5D3/1DX are not tuned for those L lenses? And can the camera's settings tune the camera to those lenses?
This is rather ot, but fyi: Download the manual, look under "lens groups" - the full potential of the 1dx/5d3 af is with few lenses (like the 70-200/2.8is2, 24-70ii) and the af spread and precision (double cross, cross, ...) degrades in lower lens groups. This is constantly missed by many 5d3 reviews, it's a shame that reviewers don't deem it necessary to flip through the manual. The lens groups are fixed and not settable in firmware, and it'll stay that way because of the lens' hardware - i.e. that's why the 24-70mk1 is in a lower group than the mk2.
Of course the 5d3 has a much more stellar af even with my lenses than the disappointing 6d af system, and the newer lenses like the 70-300L are much more precise in contrast to the 6d (see the lensrentals review on the 6d af) - but with f4 it's not the full potential, and precision matters most with large apertures (or macro, which is a problem for me on the 60d).
Imho the 5d1/1dx is meant for the current f2.8 zooms and expensive primes, while the 6d is "anti-tuned" for it because all outer points have no f2.8-precision and the center point has non-cross precision for f2.8 (it's a horizontal overlay over the f4 cross) - thanks, Canon... see also a neighbor thread mentioned above about 100L vs 200L on 5d3 in lower light.