Pentax MX - Pentax MX Meter Coupling Range

METER COUPLING RANGE
The exposure meter of the MX measures the
brightness of the ground glass. Therefore, the
proper LED exposure read-out should be
obtained after you have focused your subject on
the ground glass. The green area in the table
indicates the coupling range of the meter, 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
ASA100 film, you may use any shutter speed
from 1 sec. to 1/1000 sec. in combination with
any aperture that will illuminate the green LED
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
ASA100 film, an aperture from f/1.4 (the
maximum aperture of this lens) to f/22 (the
minimum aperture) may be used with any shutter
speed from 1 sec. to 1/1000 sec. that will
illuminate the green LED.
SHUTTER SPEED
1
1 4
1 8 1 -15
1 30
1 60
1 125
1 '250
1 500
1 1000
1,600 1
• As exposure measurements made at 1/1000 sec. with 25 ASA film will not be accurate, exercise
caution. When using the 50mm f/1.4 lens, accurate exposure measurement at the points found
in the shaded area in the above table can be guaranteed only when using up to f/16 (f/1.4 f/16).
22 ®