Depth of focus

Description

The depth of focus is the range of distances in which an image plane is in good focus. For photography, the film is placed at the focal point of the image plane. Because the depth of focus increases with increasing magnification, small errors in focus setting may not be apparent in photomicrographs made with high power objectives. Whereas minor focus changes may be readily apparent with a low magnification lens.

Synonyms and Related Terms

Tiefenschrfe (Deut.)

Authority

• ASTM, ASTM, Standard Terminology of Microscopy, Annual Book of ASTM Standards, Section 14, General Methods and Instrumentation, ASTM, E175, 75-78, May 1982

• Walter C. McCrone, John Gustave Delly, Walter C. McCrone, John Gustave Delly, The Particle Atlas, W. McCrone Associates, Chicago, IV, 1972