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.

Why are we here?
All text is available under the terms of the GNU Free Documentation License
This page is cache of Wikipedia. History