Range Of Light Measurement - Honeywell PENTAX SPOTMATIC IIa Operating Manual

Range of light measurement
The exposure irieter of the Spotmatic Ila measures the brightness of the
ground glass. Therefore, the meter should be turned on after you have
focused your subject on the ground glass. The following table shows the
range of the meter's light measurement, and should not be interpreted as
the camera's total range of f/stop-shutter speed combinations. As you will
note from the table below, with an ASAIOO film, you may use any shut¬
ter speed from 1 sec. to 1/1000 sec. in combination with any aperture that
will bring the meter needle to the midpoint in the viewfinder. The total
range of the aperture settings is, of course, determined by the minimum
and maximum apertures of the lens being used. For example, with the
50mm f/1.4 lens and ASAIOO film, an aperture from f/1.4 (the maximum
aperture of this lens) to f/16 (the minimum aperture) may be used with
any shutter speed from 1 sec. to 1/1000 sec. that will bring the meter needle
to midpoint.
B
D
n
n B
El
B Hi IB B
HmIi
B B B B
60
1000
20
• 25
32
B B
• 40
• 50
64
• 80
100
• 125
■■■
• 160
Bf
il
200
B
^
1
• 250
. 320
iiiiiiii
400
m
• 640
800
HHi
• 1000
IMP
• 1250
_■ ^ '
1600
• 2000
IMB:
• 2500
HBmmI
B||:
3200
9K
-
11
The arei A indtcites the reeding range of the meter. The area B indicates that aithough the shutter speed index is
blach and the mater needle moaes. the meter is NOT operating properly.
When the meter needle
is
centered with the shutter speed dial set at B using ASA 20~50 films, this
xnaicaies that the exact shutter speed required is 2 seconds. Please expose your picture for 2 seconds.
15