How are the DOF front/back percentages calculated in the DIstance Tool?

The DOF front/back percentages are based on mathematical formulas and are theoretical values based on a simple lens design and will vary by distance. Generally the closer the distance, the closer to a 50/50% distribution, moving to 33/66% as it approaches infinity.

With the camera's AF Adjustment and LensAlign we can choose to adjust our lens to mimic the theoretical ratios, OR we can center the focus point in the center of the DOF which gives the most leeway for the sporadic AF "errors" that can move the focus point around. We also have the creative license to push the focus point toward the front of the DOF to give more focus percentage behind the actual focus point, which some photographer prefer.

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