Originally Posted by hotsecretary
People smarter than me said the following...
<p style="padding-left: 30px;"]Autofocus
One of the differences between the two cameras is the autofocus performance. The 1Ds is running an autofocus system that seems more sophisticated and certainly more complex with its 45-point TTL, 19 cross-type points, and 26 assist points than the newer 5D Mark II’s 9-point system. However, autofocus is a fairly challenging and ambiguous feature to evaluate. Autofocus so depends on pattern, type and look of the subject, shooting conditions, as well as simple preferences of the photographer, so it’s hard to objectively compare the performance of two such highly evolved and effective systems. If you had a system that was clearly just bad, and one that was workable, you could make a clear determination. In our testing of the autofocus systems we are hard-pressed to point to a clear winner, in spite of the very strong opinions being posted on various online sources. Our best determination is that, of the two systems, the 5D Mark II may be, by virtue of its overall higher level of development and its simplicity, more effective for more applications, but it really depends on the user to make that determination.
I just know what works for me in the real world where I shoot.





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