Photometer 2 Instruction Manual
DLGelectronics.com
7
Move the metering probe within the image to measure the brightness of the various
features within the image. Adjust the “exposure” settings on the meter as required in
order to keep the display within the required range. The display is marked in whole top
numbers, so that e.g. +1 on the display indicates a factor of two in the brightness and
thus one additional f-stop on the lens aperture or one increment of exposure setting.
Normally, features that are darker than 2-3 stops from the nominal will render as full
black, with no additional detail therefore visible, and features 2-3 stops lighter than the
nominal will render as white, likewise showing no further detail.
The meter incorporates two memories, which can hold the brightness value at two points
in the image while metering a third. This is convenient when attempting to optimise the
exposure across more than one feature in the image. When the “hold” buttons are
pressed, the currently-metered brightness value is stored in the meter in the
corresponding memory.
Turning the on-off-1-2 switch to the hold 1 or hold 2 positions displays the stored
brightness.
A typical use might be as follows.
1.
Measure the image brightness in a shadow area of interest. Adjust the
exposure controls to give a reading of, say, two stops down from centre scale
in order to give a dark rendering but still showing some details. Press the
“hold 1” button to store this brightness.
2.
Move the metering probe to measure a highlight feature. Adjust the
“exposure” controls on the meeting as required to bring this into the range of
+/-3 on the display.
3.
After setting the exposure control on the meter at step 2 above, turn the off-
on-1-
2 control to the “1” position and confirm that the previously-stored
brightness in the shadow area is still within an acceptable range. If not, re-
adjust the exposure settings to bring both the highlight area and the shadow
area into an acceptable range.
Move metering
probe as
required
Sensor position
is marked by
white spot on
rear of metering
probe
