Depth of field scale
Lens opening -- Distance in feet
-
f3.5 -- 8 ft. - 30 ft.
-
f4 -- 7.5 ft. - 50ft.
-
f5.6 -- 7 ft. - 150 ft.
-
f8 -- 5.5 ft. - infinity
-
f11 -- 4.5 ft. - infinity
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