Depth-Of-Field Guide - Honeywell PENTAX SPOTMATIC IIa Operating Manual

Shutter
Turn the shutter speed dial clock¬
wise or counter-clockwise to the
shutter speed desired. The shutter
speed may be sets either before or
after cocking the rapid wind lever.
As you cock the shutter by turning
the rapid wind lever, the "cocked"
indicator turns to red showing that
the shutter is cocked.
The indicator window blacks out
as you trip the shutter button. For
use of ,the X setting on the shutter
speed dial, refer to page 17.
With the shutter speed dial set on
B (bulb), the shutter will stay open
as long as you depress the shutter
button. As you release your finger
from the shutter button, the shutter
closes. When a long exposure is
desired while using the B setting,
attach a shutter release cable with a
locking device to the shutter button.
This will permit a "Time" exposure.
Cautions
—--— iff
At slow speeds—slower than 1/30
— support your camera rigidly or
use a tripKid to prevent movement
of your camera.
2
To protect the shutter mechan¬
ism, trip the shutter release be¬
fore putting the camera out of
use for any extended period.
If you want to know how great the
depth of field is at a certain aper¬
ture, look at the depth-of-field guide.
In the above photograph, the distance
scale is set at 15 feet... the lens is
focused on a subject 15 feet away.
The calibrations on each side of the
distance index correspond to the
diaphragm setting and indicate the
range of in-focus distance for differ¬
ent lens apertures. For example, if
the lens opening of f/8 is to be used.
Depth-of-field guide
the range on the distance scale ring
covered within the figure 8 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 10 to 25
feet 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 page 14.
[
Depth of field is the range between the |
nearest and farthest distances which I
are in focus at different lens apertures.
J
13