Pentax ES User Manual

Asahi Pentax ES Operating Manual Excerpts

Reproduced for Historical and Reference Purposes by Paul M. Provencher

http://whitemetal.com

Not For Resale.

DEPTH-OF-FIELD GUIDE
If you want to know how great the depth of field is

at a certain aperture, look at the depth-of-field

guide. In the above photograph, the distance scale

scale is set at 5 meters…the lens is focused on a

subject 5 meters away. The calibrations on each

side of the distance index correspond to the

diaphragm setting and indicate the range of focus

distance for different lens apertures. For example,

if the lens opening of f/4 is to be used, the range

on the distance scale ring covered within the figure

4 on the depth-of-field guide indicates the area

in focus at the lens opening. You will note from the

depth-of-field guide in the photograph that the

range from approximately 4.5 to 6.5m is in focus.

Note that as the lens apertures change, the

effective depth of field also changes. For the depth

of fields at different apertures and distances, refer

to the next page.

Depth of field is the range between the nearest and

farthest distances which are in focus at different

lens apertures.