View Single Post
      08-07-2012, 11:55 AM   #31
Major General

Drives: 2006 BMW 330i ZPP, ZSP
Join Date: Dec 2008
Location: LA, CA

iTrader: (15)

Originally Posted by dcstep View Post
There's got to be a reason that they gave the AF system its own processor on the 1D-X.
Yes. According to the TDP review:
The DIGIC 4 processor is utilized exclusively in conjunction with a new 100,000-pixel RGB Metering Sensor and EOS intelligent Subject Analysis System (EOS iSA System) that analyses the color, brightness, motion, contrast and distance information of a scene. The 252 metering zones (the 1D IV has 63) along with new subject/scene recognition capabilities (including color and face detection) make a difference in most/all auto image quality settings - including auto flash exposures.
Apparently almost everyone is saying there is a noticeable difference in the accuracy of metering, the speed of AF, and the accuracy of AF tracking on the 1D X, as compared to the 5D3.