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“DOF” by Wm Nosal.
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600 mm f: 11 Focus Distance 50 Feet =
Total Depth of Field .72 Feet or
8 5/8 Inches of Focus

In optics, particularly as it relates to film and photography, depth of field (DOF) is the distance between the nearest and farthest objects in a scene that appear acceptably sharp in an image. Although a lens can precisely focus at only one distance at a time, the decrease in sharpness is gradual on each side of the focused distance, so that within the DOF, the unsharpness is imperceptible under normal viewing conditions. Editor

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