CdS Model D-III Exposure Meter User manual

DESCRIPTION OF EACH PART
  1. CdS cell window
  2. White plastic diffuser (for incident light measurement)
  3. Meter oointer
  4. Battery check mark
  5. Low light range scale
  6. High light range scale
  7. Zero position
  8. Low light/high light range change over and battery check
      switch
  9. Meter range indicator
 10. Shutter speed scale
 11. Aoerture scale
 12. Cine scale
 13. ASA scale window
 14. DIN scale window
 15. Outer dial
 16. lnner dial knob
  ll.  Scale for shutters calibrated in exposure value settings
 18. Light scale settings
 19. Index mark
 20. Operating           button                                                       (.' 2L.     Battery cover                                       (J.
SPECIFICATION      $v^'r l..t'
 Light reading system: Reflected or incident light acceptance
 angle: Approx 35" Measuring method: Direct reading system
I sensitivity range:EY2 to EV18 at ASA 100
        Low range: EV2 to EV10
         High range:EV10 to EV18
 ASA range:               6-6400
 DIN range:                      9- 39
 Aperture range:           F0.7 to f45
 Shutter speed range:       l/4000 sec to 4 min
 Cine camera framing rates:8, 18,24,32, 64, f.p.s.
 Power source:            ONE SIIUER (lf,IIIE.,BAT,IFNYV)
  tuilt in battery checker

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OPERATING INSTRUCTIONS
Setting the film speed
Rotate the inner dial knob (16) until the speed (ASA or DIN)
of your film appears opposite the reference mark in the appro-
piate window (13) or (14).                               i$
Selecting the correct sensitivity range                                                                                                    ItlIWith sublects illuminated by normal or light sources push the
low light/high light range change over switch towards the
bottom of the meter so that the yellow mark is seen in the
meter range indicator (9). Readings should be taken from the
upper High light range scale (6) (see below).
When metering dim or poorly illuminated scenes the extra
sensitive low light range scale (5) should be used. Push thelow light/High Light range change over switch towards the top         ll4lf
of the meter so that the white mark is seen in the meter
range indicator (9).
Light Measurements
Reflected Light Measurement. Ensure that the white plastic                                                                 lildiffuser (2) does not cover the CdS cell window (1). Point
the meter towards the subject, tilting the meter suff iciently
downwardq            used                     outdoors,                                     measuring                                avoid                                           sky areas                if                         to                                             it!lwhich would                        reading                                            underexposure.                                cause              inflate                  the                           and
Push the operatiJrg button (20) on the left hand side of the
meter and keep it depressed until you have noted the:'eading
on the light scale you have selected. Note that the white num-
bers relate to the Low light range and the yellow numbers
relate to the High light range.
Once the number which the meter pointer indicates is noted
then move the outer dial (15) until the corresponding number
around the edge of that dial is lined up with the index (i9).
Any combination of shutter speed and aperture opposite each
other on the dial will give the same correct exposure.
The combination you use will depend upon whether you wish
to arrest movement by the choice of a fast shutter speed
coupled with a large aperture (small f number) or greater
depth of  f ield requiring a smallwww.butkus.usaperture (high f number) and
a slower shutter speed.

Incident Light ly'leasurement
With this method the light that is falling on the subject is
measured. The colour, contrast or brightness of the subject
itself does not inf luence the reading when using this method.
This type of light measurement  is especially recommended
when the subiect has excessive contrast. Place the meter in
the subject position and point the CdS cell towards the camera.
Take the reading as explained in the section on reflected light
measurements.
Cine Photography
When using a cine camera the aperture  required is shown
against the  f raming rate for the camera on  thp  nino  ce ele   / 1?  \
Exposure value sett:ng
For cameras calibrated in exposure values (EV) readings can
be directly made from the scale in the EV number window
 (17 ).
Testing the battery
To test the battery first move the meter range change over
switch (8) towards the bottom of the meter uniil a green
mark appears in the meter range indicator (9). Push the
operating button (20) and the meter pointer (3) should im-
mediately swing to the battery check mark (4) indicating that
the battery is in good condition.  lf there is little or no res-
ponse, unscrew the batterv'SltUERcover (21) and remove the battery.Replace it only with a        0IIDE lA^T-TEBY,ry (oi
equivalent). Ensure when pTacrng tRe new i5ii.'&'itr-g  bat-
tery compartment that the positive side (marked+) fsces out-
wards.
CARE OF THE METER                                                                                                                                    Ii
Do not expose the CdS cell window directly to the sun for
extended periods. Take care to ensure that the meter is kept
away from mositure, high temperatures or  f rom being jolted.



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