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When you focus on a specific subject, an area "in front of" and
"behind" the subject will appear acceptably sharp in your picture.
This area is called the ''Depth of Field".
The depth of field can be determined in the following ways:
1. Each lens has a depth of field scale. For example with a
distance of 10 ft and using f/16. the area within the two
f/16 marks on the scale (about 6.6 ft ~ 26.3 ft) will be in
sharp focus.
2. When you press the Depth of Field Preview Lever. it
will set the lens diaphragm to the corresponding opening
previously set on the F-Stop ring. This enables you to
preview the depth of field of the picture.
* Please do not press the Shutter Release Button while pressing
the Depth of Field Preview Lever.
21. INFRARED PHOTOGRAPHY
The infrared index mark is an index to correct the focusing point
when you use (Black & White film) infrared film and red filters.
Since infrared light rays have a longer wave-length than visible
light rays, after focusing normally on the subject, you have to set
that distance against the infrared index mark.
Taking Infrared Photographs
1. Attach the red filter and focus on the subject.
2. Shift that distance to the infrared index mark. According to the
instructions enclosed with the film, set the f-stop. shutter speed
and release the shutter.
* Infrared light rays are invisible to the eye and the light meter, so
please refer to the instructions with the film for setting the f-stop
number and shutter speed.4www.butkus.org
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