Depth-Of-Field Guide - Pentax K1000 Manual

DEPTH-Of-fiELD GUIDE
Depth of field is the range between the nearest and farthest
distances which are in focus at a given lens aperture.
If you want to know (low great the depth of field is at a certain
aperture, focus on a subject and look at the depth ·of·field guide
on the lens. In the photograph below , the distance scale is set
at 3 meters . . . the lens is focused on a subject 3 meters away.
The calibrations on each side of the distance index correspond
to the diaphragm setting and indicate the range of in-focus
distance for different lens apertures.
For example, if a lens opening of
f/8
is to be used, the range
on the distance scale ring covered within the figure 8 on the
depth-of-field guide indicates the area in focus at that lens
opening. You will note from the depth-of-field guide in the
photograph that the range from approximately 2 .3 to 4.5 m is in
focus . Note that as the lens apertures change, the effective
depth of field also changes. For the depths of field at different
apertures and distances, refer to the next page.
6 5
2
o
Distance(m)
1/ 2
1/ 5 .6
I/ B
18e