Specifications

DEPTH OF FIELD:

When a camera lens is focused to give a sharp image of a particular subject, some objects

slightly behind, as well as some objects slightly ahead of the subject focused on, will

appear to be sharp. The distance between the nearest and farthest objects, which are in

focus, is called Depth of Field.

Depth of Field changes each time the focusing distance changes, becoming greater as the

lens is focused on points farther from the camera position, while decreasing as the point

of focus becomes closer. Other factors influencing depth of field are the focal length of

the lens and the diaphragm opening at which the picture is taken. The shorter the focal

length and/or the smaller the lens diaphragm opening, the greater the depth of field for

any given focusing distance, and vice versa.

Proper use of depth of field can enable the photographer to utilize the principles of

"selective focus," which often means the difference between ordinary snapshots and

pictures of quality. For example the proper selection of a "sharp" zone of focus can

eliminate an unwanted object in the background. The same could be true for foreground

objects.

When you wish to view the depth of field before taking a picture with the 1000 DTL, set

the lens diaphragm on " automatic". Focus with the micro diaprism as explained before.

Then press the film advance lever as if taking a meter reading. This causes the lens

diaphragm to close le. g. stopped down). If you have already taken the meter reading, the

lens is now at the diaphragm opening at which the picture will be taken.

The depth of field now appears in the finder exactly as it will be in the finished picture.

By changing the focus while the lens diaphragm is stopped down, you can select the area

of sharpness in your picture. When using non-automatic or pre-set lenses, the diaphragm

must be closed manually, but the same results can be achieved.

You may also determine depth of field by checking

the scale 115) on the lens barrel (Refer to Figure

Q). Numbers representing lens apertures appear at

the near and far limits of depth for any given focus

distance and lens opening.

For example, if the standard lens is focused at 30

ft., one of the lines representing f/11 appears at the

15ft. mark. The other line [again representing f/11)

is at the infinity symbol. What this means is that if

a picture is taken with the lens focused at 30 ft.,

and the diaphragm is set at f/11, all objects in the

picture between 15ft. and infinity will be in focus.

This method is extremely valuable when the lens

diaphragm is stopped down too far to allow enough