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21/03/200716:27
December 2006
USER INSTRUCTIONS
MG500P
ILFORD MULTIGRADE 500P EXPOSURE PROBE
FOR USE WITH THE ILFORD MULTIGRADE 500 EXPOSING SYSTEM
The
ILFORD MULTIGRADE 500P
exposure probe is for use with the ILFORD MULTIGRADE 500 exposing system, to
provide automatic assessment of exposure time at the grade selected from a spot reading.
1 CALIBRATION
The calibration system is very straightforward, and provides a sound basis for obtaining correct exposure times when using
the probe. The probe is supplied with a test negative to help with initial calibration. When you become more familiar with
the probe you may wish to carry out the following procedure using a negative that you consider to be more representative
of your own work.
a) Using the test negative supplied, make a satisfactory print on ILFORD MULTIGRADE paper using, for example, grade 2.
Make a note of the exposure time and grade used. The exposure time and the enlarger settings must not be changed during
the remainder of the calibration procedure.
b) Plug the MULTIGRADE 500P exposure probe into the ‘probe’ socket at the rear of the control unit.
c) Press ‘focus’ (MULTIGRADE 500CPM control units) or ‘auto’ (MULTIGRADE 500C control units.)
d) Position the probe photocell on the projected image on the area bounded by the clear ring. Once the probe is
positioned, do not move the probe or lean over it while the probe is taking a reading.
e) Press and release the probe switch. The probe provides information to the control unit which, in turn, calculates and
displays the optimum exposure time, based on image intensity. The calculation incorporates a correction factor to take into
account any background illumination, e.g. safelighting.
f) If the display does not agree with the exposure time noted in operation (a), adjust the probe calibration knob to a lower
setting (towards 0) if a shorter exposure time is displayed, or to a higher setting (towards 9) if a longer exposure time is
displayed.
g) Repeat operations (e) and (f) until the display agrees with the exposure time noted in operation (a).
Note. In all cases, choose the calibration knob setting that gives the closest match. Never attempt to position the knob
between numbers.
h) If calibration cannot be achieved within the range of the knob, carry out the procedure detailed in section 2 below.
