Who is this camera for? With ISO set to Auto, the available "P" (Program) mode provides near-fully automatic functionality. The following table shows comparative RAW file sizes for a photo of a standard in-studio setup with a moderately-high amount of detail taken with the referenced Canon EOS DSLR body. AFPO9o.src = 'https://media.the-digital-picture.com/Images/Other/Canon-EOS-1D-Mark-IV-Digital-SLR-Camera/AF-Point-Options/9-Outer.gif' There's a problem loading this menu right now. get perfect framing - with potentially 1D III or more resolution remaining. 70-200mm f/2.8 L IS USM + Extender EF 1.4x II There is no mo… The first full charge on my new 1D IV battery yielded 1771 pics with 27% capacity remaining. I have now encountered the unintentional AF-On button press in a couple of additional situations. B21.src = 'https://media.the-digital-picture.com/Images/Other/Canon-EOS-1D-Mark-IV-Digital-SLR-Camera/Burst/21.jpg' A typical focus point covers more area than shown by the AF point square in the viewfinder. An image quality-related 1D IV improvement is the new white balance algorithm that attempts to make colors more accurate when Orientation-linked AF point selection allows different AF points to be selected for horizontal and vertical camera orientations. [Canon EOS-1D Mark IV White Paper] If, even after evaluating the differences, you cannot see a clear low-noise winner in these comparisons, I was not thrilled to lose my AF points when the 1D III arrived - I'm glad to have them back. Reviewed in the United States on July 14, 2019. Canon 1Ds Mk III 20 August 2007 . I love it. Auto expsoure modes use center-weighted average metering. I can dial in the M mode fixed aperture and shutter speeds I want and let AE determine the ISO setting needed.