Konica FS lightmeter User manual

KONICA LIGHT METER
  The KONICA LIGHT METER  is designed for
use with the KONICA FS single lens reflex camera.
It  is a reflected light, battery-powered photocell
exposure meter which clips on to the camera, with
the shutterspeed dial  of the meter  mechanically                                                                                                                                'coupled to the shutterspeed dial of the camera.
  The photosensitive element of this  light  meter
is a semi-conductor, cadmium sulphide (CdS),
which is far more sensitive than the  conventional
selenium photocell. This permits the measurement
of the light value of subjects too dark for  selen-
ium. Moreover, because the coverage angle of 40"
approximates the picture  angle of  the  standard
lens, accurate determination of exposure settings
can be made from picture-taking  position.

GENERAL DESCRIPTION
      Cross-Coupling System:
          Mechanical coupling of shutterspeed dials, direct reading
            of aperture  setting for nanual selection.
     Measurement Principle:
           Reflected light pick up by cadmium sulphide  photocell,
           high and low LV  ranges.
       Sensitivity  Range:
         LV  2  (1 Sec. at  I/2)  through LV  tT  (1/1000 Sec.  at
      ,        I/16) when using filmspeed ASA 100.
     Coverage Angle:
          40" diagonally across frame.
      Photosensitive Element:
        Cadmium sulphide (CdS) semi-conductor, 5'.5X8.4mm.
     Power  Source:
           1.3 volt mercury dry battery  (Mallory 625 or 630, To-
          shiba TH-NC,  orwww.orphancameras.comNational MD).                                                                  j
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Power Source Check:
   Mercury  battery  can be checked by pressing   battery
   check button and reading meter  indication
 Filmspeed Range:
  ASA  6 tO ASA 32OO    DIN 9 tO DIN 37.
 Shutterspeed  Dial  Settings:
   B. 1 to 1/1000 Sec.
 Aperture  Scale Range:
    f./1.4 throush f/16.
                 CAUTIONS:
  When not using the KONICA  LIGHT  METER'  do not
fail  to turn  selector  switch   to \OFFI  position
  Do not  to  expose excessive  humidity and heat  (not
more than 60'C).
  Do not subject to vibration or shock
  When storing  for any length of  tinre, remove fromlea-
 ther  carrying  case,  and place  in dry wooden box  with
some desiccant. Avoid storing in metallic container.

ffiQUNTING TTIEIIGI{T ftTETER
    ON THE CAMERA

                                    (1) While'  keeping  the
   A perture D ial                      mounting  catch open, fit
                        KONICA LIGHT ME-
                         TER  over top of penta-
                                           pri srn housing so that
                                   the mounti.g fork  slips
                                  squarely   over     the
                                accessory mount below
                                    the eyepiece guard-
                              Release mounting catch
                                       to permit  it  to hook onM o u n t t n gC a t c h  M o u n t i n g F o r k  C o u p l i n gP i n
                                eyepiece guard-

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(2) Turn the shutterspeed
     dial, €ither to the right
                                              Photocell W indow   Battery C h a m b e r C o v e r    or  to  the   I ef t,   unti I
    coupling pin catches on
   camera    shut ter speed
     dial, and both dials turn
    toge the r.

 TO REMOVE
      FROM CATUERA
   Open   the   mounting
  catch, and  lift  the  light      Coupling Pin   M ounting Catch   Z e r o A djust
 meter  upward and away
  from the camera.

When the subject is brightly illuminated (in bright sunlight or
 under good artificial  lighting) turn selector switch  to  oHl
  (higtr LV  position). Choose  your  shutterspeed  depending
  generally on  your  subject, and set the shutterspeed  dial
  accordingly. Point  your camera toward  the  subject.  The
  light reflected by the subject will  strike the photocell, and
 cause a deflection of  the meter needle.  Because selector
 switch is at  \H* position, read orange-colored"  high LV
 scale to obtain aperture setting (f/value). Setyourcamera    1
 aperture control  to this value.   If,  because brightness of
 subject is insufficient, the meter needle is  not  deflected
 onto the orange-colored high LV  scale, turn  shutterspeed
  dial  to slower speed.

IYHEN NOT USING KONICA LIGHT  lvETER, ALWAYS
TURN SELECTOR  SWITCH TO   \ OFFI  POSITION.

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camera toward subject, and read white,  low LV  scale  to
obtain aperture value.  If  the meter  needle stays  on  the
high LV  scale, and does not move over onto the white, low
LV  scale, turn shutterspeed dial  to slower speed setting'
                                                                                                                                  ril

    If  the meter needle is deflected  all  the waY across the
                                                                     *
 scale, ihe subject is too bright  for low LV  range     ('L:
                                    \H1, and use orangelposition). Turn selector switch  to
 colored, hish LV  scale.


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IWhen  aperture  is pre-set  at some desired  value      If,  for any r6ason, you to wish  a take picture  at  q  1f
  glven aperture setting, first  adjust aperture control  to
  desired value, then turn selector switch to either \H.. or
  \L;  positioru Point camera toward your subject, then by
  turning the shutterspeed dial  bring the high or low LV
  scale  ( depending on  position  of  the selector  switch )
  graduation indicating the sperture value you have selected
  on your camera into alignment,  through the guide  line,
  with  the meter needle. You will then automatically obtain
  the correct  shutterspeed for  the aperture size you have
  chosen beforehand
     In  this case, do not leave shutterspeed dial  at  inter-
  mediate positions. Move to click stop position, and make
  fine adjustments by means of aperture control.

SPECIATWAYS OF USING
        YOUR KONICA TIGHTMETER
  The KONICA  LIGHT  METER  functions on reflected
light  to indicate correct  settings for optimum o<posure.
Consequently,in common with  all meters of this type, there
may be situationsin  which simple measurement of  bright-
ness from the picture-taking position will not give satisfa-
ctory  results. Extraneous lights and reflections may cause
di stortion  of measured values. In the cases described below,     T
use special procedures.
Scenery with  big amounts  of  bright  sky.  The bright
sky will cause the meter  to indicate higher light value than
that appropriate for the foreground and main,subjeet-                .b
matter.  In such cases, measure brightness of  the subject
at close range,orpoint your,cameratoward the foreground
to eliminate most of  the sky, choosing some reference spot
midway between your feet and the horizon or  skyline.
When photographing people against bright background
 (reverse lighting)  or  when  brightly    lit  subject  is
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photographed against  dark backgr.ound-    Measure
brightness of  subject at close range (the closer the bett-
er)- to minimize  the effects  of  the background.-        If
brightness measurement is done from  picture-taking  po-
sition you will obtain under-or overexposed negatives.
When performing  copying work.  See that subject and
photocell window are squarely face to face.  If  subject is
a white sheet of paper, the correct  value  will  be indi-
cated.  If  subject ls-dark   (or black portions predominate),
cover with white paper when determining exposure.
When using color  film.  The normally bright Portions'
of  the subject matter should be used as the standard for
light value measurement; .In the case of color photography,
thle contrast between bright  and   dark  portions  (color
balance) of the subject  is as important  at correct  overall
exposure. The ideal ratio  for good color balance is 1 I 4
for dark versus light  portions.

IPOWER SOURCE CHECK
  'Vllhenyou press the battery check
                    'buttoq  the meter needle should move
and point to the battery checkindicati-
on.  If  deflection of the meier needle
is below this mark,  the mercury  dry
battery poweringthe KONICA LIGHT
METER shouldbe replaced. Mercury  Battery
dry batteries are not prone to self-dis-
charge,  while their potential remains       ryl"r"ui  ffi
fairlyconstant until the end of service   Dry Batteri                                                                                  ffiffi
life. Suddendrop of voltage at end. of                                               i
capacity is a characteristic  of this type BattervChamberCover
 of batterY.

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TIRCURY DRY       ZEROADJUSTrENT
BATTERYREPTACEffIENT                                                               If , when the  selector
  To change battery, use coin  to                                    switch  is  at  \OFF.. po-turn counterclockwise the battery
                                           sition, the meter  needlechamber cover on underside of the
light meter. A  slight  twist    will   does not  indicate  \O:,
unlock cover  for easy removal.       correction  can be made
Replacementbatteries are standard                                  by turning the zero adjustmercury cells available   on   the
market (1.3 volt, Mallory'625  or   screw on the underside of
630, Toshiba TH-NC,  or National   the  light  meter.  Use a
MD).  Place the positive (*)  side   small screwdriver, turningof the battery on the inside of the
                                     gently right or  left  untilcover. Insert  battery and  cover
in the battery chamber, and twist   needle is zeroed in.
to the right  to secure.

SEKONIC STANDARD REFLECTOR'BOARD
  This standard. reflector  board is  of neutral  coloration,
and is designed to reflect  t8%  oI   the  light  impingrng
upon it.  Since under any lighling condition it  will  reflect
only ISVoof the light  to which  it  is exposed,  it  serves
as a standar4 the equivalent of  the average   reflecting
property of  all photographic subjects, or the mean of the
light and dark portions when contrasts are present.

  To use this standard reflector,  place it  parallel  to the
main surface of  the subject, under the same lighting
conditions, and measure its  brightness from a distance of
10 qn. Use the value obtained for  adjusting the exposure
settings of your camera. The use of this neutral standard
board is particularly  helpful when working- in color.

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oN cADrwumsurPHlDE(cds)
  Cadmium Sulphide is a semi-conductive compoundwhich
changes its resistance in proportion to the brightness of
the light   it  receives.  It  differs  from  the selenium pho-
tocell which generates electricity  when excited by light,
and therefore requires no outside source of power. The
more sensitive CdS element uses a battery as the prime
source of power, and the changes in  resistance, caused
by varying intensity of  light, are indicated by the meter.
The CdS cell is-unaffected. by heat and. humidity, and is
several hundred times more sensitive  to  light  than the
selenium cell.