Ricoh 500 Owner’s Manual Page 8 of 14
So long as there is no change in the light value, the required
exposure is constantly and automatically ensured, whatever the
shutter speed or f stop you set. However, at f/2.8 the f stop window
stops moving any farther, so that if you move the shutter speed
setting ring beyond this point, the light value figure will get out of line,
and the result will be underexposure.
Similarly, when a slower shutter speed is required, moving the
shutter speed ring beyond the f/22 point will result in the light value
figure getting out of line, and this will result in overexposure.
Medial points just between the light values may be used, such as
3.5, 4.5...16.5.
When the shutter speed is set to "B" the shutter will remain open so
long as the shutter release button is pressed.
The figures stand for fractions of a second, so that 1 means 1
second, 2 means 1/2 second, 4 means 1/4 second, and 500
means 1/500 second. The aperture or opening is bigger in proportion
to the smallness of the f stop number and is smaller
in proportion to the largeness of the f stop number; and the opening
itself is a 5 sided hole as illustrated in Figure 14.
As illustrated in the following chart (Figure 18), the depth of field of
focus increases in proportion to the smallness of the opening or f
stop, and decreases in proportion to its largeness. It is this range that
is commonly referred to as the depth of field.
Consequently, apart from the fact that you will have to make sure
your subject is in sharp focus, give full consideration to this important
factor. For instance, in taking a picture of a person, the blurring of the
background by using a wide opening will make the person stand out.
On the other hand, when taking a group picture where people are
standing in rows a small opening becomes necessary to ensure
Thus, if you set the opening at f/8 and the distance scale at the red
mark, everything will be in sharp focus from 10 feet to infinity. (See
Figure 15.) For taking sequence shots referred to in a subsequent
section this will prove of immense advantage.
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