Operation Manual

DEPTH OF FIELD

When the lens is focused on a subject at some distance, not only the subject but also a certain area around the

subject will be sharply delineated in a photograph, and this area is known as a depth of field and has the

following features.

a The bigger the f-number, the larger the depth of field,

b. The further the distance at which the lens is focused, the bigger the depth of field is.

c. When the lens is focused on a subject the depth of field is bigger for the section in Wont of the

subject than the area behind the subject

d The shorter the focal length, the bigger the depth of field

The depth of field may be ascertained either with the depth-of-field scale or with the manual aperture, As for

details, reference is made to the table of depths of field.

Using Table of Depths of Field: The Depth-of-Field Scale (6) is so calibrated that readings identical to

those of the lens aperture are provided on both sides of the Distance Index Mark (51). For example, let us

assume that the distance between the film plane and the subject on which a 57mm f/1.4 lens has been focused

is 30 feet. The depth of field will be 22 to 46 feet for f/4 and 13 feet to on (infinity) for f/16.