"One of the important design goals for Canon’s engineers in developing the new 61-point High Density Reticular AF system in the EOS 5D Mark III and EOS-1D X was to truly optimize the performance of each point on the autofocus sensor. It’s easy to toss around terms, but if a photographer is not clear on what they mean, they may miss out on a lot more than a marketing pitch. Knowing the characteristics of the AF array in these cameras puts the photographer in the position to get the most out of the AF system.
Cross-type AF points: what are they?
Certainly a fair question. And all the more so, because it's not something the photographer can see just looking through the viewfinder. Perhaps the easiest way to answer it is to take a trip down memory lane in AF SLR design..."
Read the information-packed article on the Canon Digital Learning Center. (thanks Stuart)
"As photographers, our goal is to recreate the scene before us using both light and color. As advanced as digital cameras are these days, they don’t yet match the complexity of the human mind so we have to work with a few technical limitations when trying to record a scene as our eye sees it. Snow covered winter landscapes, in particular, can present some very specific challenges when it comes to getting accurate looking colors.
If you’ve ever looked at one of your winter images and thought that things look a little blue, then you’ve discovered one of the challenges of photographing snow: getting the right white balance or color temperature. White balance is a fundamental camera setting that adjusts color rendition to give a neutral appearance, without any obvious overall color tints or shifts. Cameras come with several White Balance presets (Daylight, Tungsten, Flash, etc.), but difficulties can arise when there are mixed light sources all adding their own color cast. In fact, it doesn’t even need to be a direct source either because all reflected light will have a color cast that’s dependent on the color of the object the light just bounced off of. If there are objects in your image (quite likely!) then you’ve got multiple color casts, in some way."
Check out the entire article on the CDLC Blog.
Even considering the recent changes reflected in the text, most 5D Mark III owners will find most of the information in the 1DX AF Settings Guidebook to be illuminating, relevant and useful.
Download the EOS 1D X AF Setting Guidebook (PDF, 12.2MB) for more information.
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