Pentax MX User Manual

DEPTH^OF FIELD PREVIEW LEVER AND SCALE
Depth of field is the range between the nearest and farthest distances
which are in focus at a given lens aperture, (f you want to know how
great the depth of field is at a certain aperture, focus on a subject
and look through the viewfinder while moving the Self-timer lever
toward the lens, and you will be able to preview the depth of field.
Or, after focusing, look at the depth-of-field scale on the lens. In the
photograph below, the distance scale is set at 5 meters; that is, 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 in-focus distance for different lens apertures.
For example, if a 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
scale indicates the area in focus at that lens opening. You will note
from the depth-of-field scale in the photograph that the range from
approximately 4 to 7m is in focus. Note that as the lens aperture
changes, the effective depth of field also changes. For the depths of
field at different apertures and distances, refer to the next page.
Distance (m)
20 ^

Pentax MX Specifications

General

Film Format	35mm
Lens Mount	Pentax K mount
Exposure Modes	Manual
Focus	Manual
Camera Type	SLR
Shutter Speed	1 to 1/1000 second, plus B
Metering	Center-weighted