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The ratio of the amount of Depth of Field (DoF) in front of the focus distance to the amount of DoF behind the point of focus is highly variable. At Minimum Focus Distance (MFD) most lenses give a DoF that very closely approaches 1:1 or 50/50. At any focus distance past the hyperfocal distance the DoF ratio is 1:∞. The common 1:2 or 33/67 rule of thumb is ...
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