CFn IV Focusing Screen
To obtain proper exposures, use this function if you install one of the two other interchangeable focusing screens Canon offers for the 5D Mark II. You have choices for the Eg-A, Eg-D, and Eg-S focusing screens. The Eg-A is the Standard Precision Matte screen that comes with the camera, and the Eg-D is a Precision Matte screen with a grid etched into it, which is great for architectural photography and any situations where lining up vertical or horizontal lines would be beneficial. Eg-S is a Super Precision Matte screen that's popular with photographers who do the majority of their focusing manually because it provides a super-bright screen with which to do so. This is also one of the Custom Functions that can be included if you register your camera settings in My Menu, but you can't register and recall them by switching to one of the C modes on the Mode dial.
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