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| p.1 #19 · Why is the 5D3's AF system so sensitive to the lens you use? |
Yakim Peled wrote:
This AF system separates all EF lenses to 8 groups and only when you use lenses in group A can you exploit its full potential. Unlike all other AF systems which changed behavior only when the max aperture changed this AF system is sensitive to particular lenses (6 pages in the manual). It's not a matter of price, max aperture, discontinued or still in production, AF motor type or what have you.
Does any one have an idea why Canon designed this AF system this way?
Well ignoring a few groups that have either junk lenses that no one on earth would use with their 5D III or a single lens, the main difference between the groups is that of f/2.8 lenses and f/4 or slower lenses. Of course you only get the maximum potential with the fast glass, but even f/5.6 lenses work dam well on the 5D III and you still get 21 x-type points.