Exposure Measurement - Pentax MX Manual

EXPOSURE MEASUREMENT
When the rapid-wind lever is pulled out 20® and the shutter button
is depressed halfway, the exposure meter is turned ON. Turn the
aperture ring to get a proper LED exposure read-out in the
viewfinder.
On the right-hand side of the viewfinder, appear the preselected
shutter speed plus two adjacent speeds (e.g. "60" and "250" in the
case of "125") on a transparent disk which protrudes slightly into
the focusing screen area.
On the right-hand side of the shutter speeds shown, there are 5 LED
dots which are normally not visible. If you depress the shutter
button halfway and the exposure is correct, the central green dot
will illuminate. If the exposure is 1/2 EV over, the orange dot next
to "250" (in the above example) will glow; as will the dot next to
"60" in the case of 1/2 EV underexposure. If it is 1 EV or more
over or under, the appropriate red dot will glow as a warning for
adjustment of either the f-stop or the shutter speed, unless you want
to make intentional over or underexposure.
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