Scale focus

Zone focusing fixes a depth of field, which can be read off of the DOF scale on the focus ring, as shown here – DOF is 1 meter to 2 meters, with aperture f/11 and focal plane at 1.4 meters.

Scale focus, or zone focus, is a type of focusing system used by many inexpensive cameras from the 1940s and 1950s. These cameras have an adjustable focus, but lack a focusing aid such as a rangefinder. It is necessary to determine the distance to the subject and set the focus using a scale printed on the lens. If you are good at estimating distances, or have a tape measure at hand, you can get precise, sharp focus with one of these cameras.

单词	Zone focus
释义	Zone focus 英语百科 Scale focus Scale focus, or zone focus, is a type of focusing system used by many inexpensive cameras from the 1940s and 1950s. These cameras have an adjustable focus, but lack a focusing aid such as a rangefinder. It is necessary to determine the distance to the subject and set the focus using a scale printed on the lens. If you are good at estimating distances, or have a tape measure at hand, you can get precise, sharp focus with one of these cameras.
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Zone focus

Scale focus