Agfa LUCIMETER-S User manual

Key to lllustrotion           @  Film Speed Settins Ring
                                                 (rototoble in both
                                                 directions) occording to DIN
    Setting Frome@                                        ond ASA
    Exposure Pointer                                        Diophrogm Scole@                       @
   Exposure Volue Scole                                              Shufter Speed Scole@                       @
   T rio n g u lor M o r k    i n d i c o t i n g  t h e                                                Milled Ring for centrolising the@                       @
   exposure volues                        exposure pointer     in the sett-                                   @
                                                 ing frome    Setting the Scoles                   @@
     (rishr DlN,  lefr ASA)                        Eyelet for neck choin                       @

The Agfo  Lucimeter S,  if purchosed without o cose, is supplied in o  lrons-
porent contoiner. ln order to toke out the exposure meter the thumb is pressed
ogoinst the boftom port below the serroted gripping bor, ond the  lid opened
with the oiher hond on lhe gripping bor.
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Alphobeticollndex
                          po g e                            poge
Artificiol Light Exposures     1 8     Mo in te n o n ce                 n
Centrolising the Exposure           Neck Choin ond Cose       21
   Poi nter                    6-9     Reoding of  the Meosurement
Choice of Exposure Time -                Result                      1.r--12
  C o mbin o t i o n             12-14      wifh exposurevolue shutter 10
                                         without exposure volue
Close-Up Meosurement         l4-lJ       shutter                   10-12
Conversion Toble of Film                  o) 1/so,rlm, rl::zr sec., etc.  '10
  Speed Rotings            22                                               b)  rlrs, rlso, Tlno sec., etc.  11-12
Heot Conductor (climotic                  with cine comeros         18-.19
   odiustment)              20       Reflected Light Meosurement   7-9
 Incident Light Meosurement   16-18   Setting ihe Film Speed        4-5

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Deqr Pholo-Amoleur:

      In your new Agfo Lucimeter S you now own o relioble guide to the perfectly
    exposed picture.
     whether you use colour or block-ond-wh;tefilm, you ore now certoin to be obre
      to employ the lost refinement in exposure technique.
     Since we meet border  line coses here os in meosuring technique everywhere
t    ofelse,thiswebooklet,hove describedto moke themyourselfin defoil.fomiliorDowithtokethes  potentiolitieslittle rime overof theyourstudyex-
     posure meter. The operotion of the Lucimeter S is so simple thot  it requiresI      neit her t ime n o r  t h o u g h t .
     our designers hove not only considered the speed with which the meosuremenl
     results con be reod, they hove olso mode ihe mechonism proof ogoinst the
    extremes of climote ond designed o pleosing instrument oltogether.

Settingthe Film Speed

Most probobly your photo deoler hos olreody exploined to you thot there ore
types of film of vorying speed. The film speed is normolly printed on the film
corton. This volue must be tronsferred to the ASA or DIN scole respectively.
It  is best to grip the Lucimeter S with the  left hond turning the inner setting
ring with  ihe thumb  of the  right hond,  until the required speed volue  lies
o p p o s i t et h e b l o c k t r i o n g u l o r m o r k ( i n f i g . 2 : 5 0 A S A / l 8 0 D I N ) .
ASA volues ore set in the  left hond window, DIN volues in the right hond
window.
when  using films the speed of which is indicoted occording to onorher system
pleose refer to the film Speed Comporison Toble on poge 22.

Reflectedond Incident Light Meosurement
       In the first cose (reflected light meosurement) the light reflecied by the subiect
        is meosured: the exposure meter being pointed ot the subject from the comero
      position, without the opol diffusing plote; this is colled reflecled lighi meos-
      uremenl.
       In the second iose the light incidenf on the subiect is meosured: the exposure
      meter, lhe opol diffusing plole in position, is pointed ot the comero from the
      subiect; this is colled the incident light meosuremenl.
                 reflecled light meosuremenl is the most populor meosuring methodf    Since the
     we wont  to describe  it  first. Here, os we hove olreody mentioned, the Luci-
      meter S is olwoys used wilhoul the opol diffusing plote. ln cose it is in position
        in  front  of  the meosuring window,   it must be  pulled downwords from  its
      grooves. lt con be stored conveniently in o speciol comportment, both  in the
      trqnsporent box os well os in the cose of the exposure meter.

You now  point your exposure meter-crs you would your comero during on
exposure-ot  your subiect, the reflected light from which posses through the
m eos uring w in d o w o n d  f o l l s o n th e p h o io e le clric ce ll in sid e th e in str um ent.
coution: The meosuring window  of the cell must on no occount be obscured
by your fingers!
The incident light generotes on electric current which couses q deflection of
the exposure pointer. This pointer deflection will  be smoll with weok  light,
ond greot with strong light. The exposure pointer must now be centrolised in
the setting frome which is olso visible in the scole window (see fig.5). To do
this the outer milled ring (9) (see fig. 1) is turned wiih the thumb.
when  using colour  Reversol Films (e. g. Agfocolor Reversol Films) it  is rec-
ommended to direct the Lucimeter to the  light ports of the subiect. For sub-
iects with smoll brightness differences (e. g.  in  fog, bod weother or  in the
shodow) it is more convenient to set the film speed scole on 25 ASA (l5o DIN)
insteod of 50 ASA (l8o DIN). This rule opplies only  to colour reversol films
ond only  t o   t h e   i n d i c o t e d c o s e s.
When  using o negolive colour  film point the exposure meter olwoys to  the
essentiol ports of the subiect.

F i s . 5

            R e o c l i n g
                                           t l r e M e c r s u r i r - t c 1R e s u l l

                            lf your comero hos on exposure
               volue shutler you  should reod
                                t h e r e l e v o n t r e d e x p o s u r e v o l u e
                n u m b e r o p p o s i t e t h e  t r i o n g u l o r
             mork  of  the  cut-out  morked
                with  the  Letter L ond  tronsfer
                            it to the shutter of your comero
                           ( e .g . e x p o s u r e v o l u e l 2   i n  f i 9 . 6 ) .
               For comeros without exposure
                 v o l u e s h u t t e r y o u w i l l   f i n d  t h e
               result   of   your  meosurement
                (stop number ond shutter speed)
              on the bottom scole (e. g. stop 8
                o n d t / r i o s e c . i n F i g . 7 ) .
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The block numbers on the shutter speed scole represent froctions of seconds
 (e. g. 60 :  rlm, 125:  rlns, 500 :  1/roo,'l :   I second), ond the green numbers
 f ull s e c o n d s .
When using the green numbers (shutter set ot B) ond the slow instontoneous
speeds from  I  (:    I second) fo 15 (:   rl:r" second), o tripod ond o coble releose
should be used. Thus comero shoke con be ovoided ihot would be encountered
durin g h o n d - h e l d e x p o s u r e s .



lntermedioteSettings
During  the  centrolising of  ihe  exposure pointer   it moy hoppen  thot  the
white triongulor mork  settles between two exposure volue numpers, or,  re-
spectively, the shutter speed between two slop numbers. The tronsfer of such
o reoding to your comero is possible ond correct. However, you must only use
full shutier speeds, but inrermediore srop volues (opertures) moy be set. _y
                                                                 1 l

should you own o comero whose shutter speed series differs from  the  lineor
scole olso used on the Lucimeter, you should olwoys set the next shutter speed
 i. e, for instonce,
                                              tln     7lz-o  Tlso    lllr,o
                                         .
                    rnsteod                                 of      lla      tl:o    Tlao    rl:'jzs

Which ShutterSpeed/Stop Combinotionshould be set?
We  ore sure you know from your operoting  instructions of your comero thot
the exposure of your film depends on two foctors, the exposure time ond the
operture stop. With the oid of these iwo foctors, therefore, o setting odoptoble                                            l
to the lighting conditions ond the subiect con olwoys be found.
The Lucimeter S focilitotes this setting quite considerobly for you, os  it offersyou lhe precise volues, i. e. os            J
                    shulter speed/stop combinotion for oll comeros
            .             wilhout exposure volue shutter
          ond os exposure volue for  oll comeros
                     wilh exposure volue shutter.
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Let us ossume fhot the meosurement permits, os con olso be seen from fig.6
 ond z the setting of the following shutter speed/stop combinotions:
 Stop:                   fl2    2.8    4    5.6   8        ll    16  22  n    Exposure
Shu t f e rs peed t      r / r o o o r l s o o r l z so tlr2 s  tla o rlso  rls   lla  r7 n :Vo lu e 12
since eoch of ihese shutter speed/stop combinotions ollows the some quoniity
 of light to reoch the film, oll you hove to do  is to choose ihe one most fovour-
 o.ble to your subiect. The following wiil ossist you in moking this choice:
 lf you wont  to photogroph o londscope where foreground os weil os bock-
ground ore  lo oppeor shorp  in the picture, the setting of  o  smoll stop  is
necessory (see obove scole e. g.  f/ll  ond 1/:c sec.).
 lf, however, you wonr ro copture o ropidly moving subiect, o fost shutter speed
is indispensoble, if o  sufficiently shorp picture is to be obtoined (see obove
scole e. 9. llzso sec. ond f/4).
In  the  first cose o slow  shutter speed should be  set  in  the  interest of  o
smoller stop, in the second cose o  lorge stop should be chosen to be oble
to set o foster shutter speed.
                                                                                 't3

A comero with exposure volue shutter mokes it eosy for you to set the shutter
speed stop combinotion most  f ovouroble to  the subiect by one movement
d i r e c t o t  t h e c o m e r o s h u t t e rr i n g .
 l f y o u h o v e o n y d o u b t s o t o l l o b o u t  t h i s , p l e o s e re-reod the chopter deoling
w i t h t h e o d v o n t o g e so f  t h e e x p o s u r ev o l u e s h u t t e r
in tlre operoting irrstructionsof your comero.




lrr coses showing extreme brightness difterences
i n   t h e s u b i e c t , o r    i t s c l o s e s t n e i g h b o u r h o o d , o
c l o s e - u p m e o s u r e m o n ti s  r e c o m m e n d e d .I n o r d e r
to effect this you opprooch the most importont
p o r t o f   t h e  s u b i e c t c l o s e l y e n o u g h w i t h  y o u r
L u c i m e t e rt o e l i m i n o t e t h e d i s t u r b i n g i n f l u e n c eo f
t h e s u r r o u n d i n g s T h e  f o l l o w i n g  r u l e m o y s e r v e
y o u o s o g u i d e'

                                  F i s .8
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lf  ony  further opprooch, or  o
s l i g h t  t u r n o f   t h e L u c i m e t e r n o
 l o n g e r c o u s e so n o t i c e o b l ec h o n g e
 i;r the poirrier deflection, the cor-
r e c t m e o s u r i n g i s c o m p l e t e d .T h e
exposure is to ken  f rom the orig-
i n o l l y  c h o s e n c o m e r o v i e w p o i n t
w i t h    t h e m e o s u r i n g r e s u l t  t h u s
determined.





                            F i s .9

Incident Light Meosurement

 lf the foregoing close-up meosurement of o subiect with lorge brightness differ-
ences is impossible, either becouse one connot get close enough to the subiecl
(e. g. due lo o snow field, o river or for other reosons), the light meosurement
method described below must be chosen.

Two extreme exomples moy moke this cleor:
When o person in o bright dress is loken ogoinst the bockground of o dork
wood, she would be over-exposed with reflected light meosurement, owing to
the preponderonce of the dork port of the subject.
On the other hond, lhe some meosuring method would leod to for too shori      t,on exposure time for o chimney sweep in o field of snow, so thot in the positive
he w ould opp e o r m e r e l y o s o s i l ho u e tte .
lf o close-up meosurement is not possible in such coses or the brightness differ-
ences ore oltogether so greot os to moke reflected light meosurement of doubt-
f u l v o l u e , y o u s h o u | d c h o n g e o v e r t o i n c i d e n t l i g h t m e o s u r e m e n t . >

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Now, holding the instrument level, turn  in the direction of the comero ono                                                                                             ttIreod ihe result of the meosurement. In diffused lighr,  i. e.  in  bright generol
light in g w it hou t v i s i b l e s u n l i g h t , it  is b e st to o p p ro o ch th e su b ie ct o n d tur n
round to toke the meosurement, i. e. in the direction of the intended comero
viewpoint.
With  ortificiol light sublects, too, the light  is olwoys meosured from the sub-
iect, irrespective of whether one or severol light sources ore used.



For norrow-gougecine-comeroowners
                                                                                          IIYou con reod your exposure volues off your Lucimeter for your norrow-gouge
cine-comero too, provided you know lhe shutter speed ot which  it operotes;
this con be obtoined from your operoting instructions.
lf your comero provides single frome exposure, o second ond longer exposure
t im e will be g i v e n f o r  t h i s o p e r o t io n .

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lf, for instonce, o shutter speed of 1/so sec. is stoted for the normol comero
  rt.  speed (16 fromes per second) pleose reod the stop focing 1/3s second on the
  if    Lucimeter. With  o shutter speed of  7frr" sec., os on your Movex 88, the stop
  ,    corresponding to the position on the holf-woy mork between 1/30ond 1/ooof o
     second must be set.

     The stop setting thus determined  is lronsferred to  the norrow-gouge cine-
 .    comero ond ensures the correct exposure of your film.
           lf your norrow-gouge cine-comero provides other speeds in oddiiion, you must,
      storling from lhe bosic l6 f.p.s. setting,
            close your lens by one stop (next lorger stop number) for 8 f.p.s.,a
          open your lens by one stop (next smoller stop number) for 32 f.p.s.,
          open your lens by two stops for 6,4 f.p.s.

 I      ln  this woy  the Agfo  Lucimeters con olso be used for norrow-gouge cine-
 I    come ros .
                                                                                                                                                             ' ) 2         to,-/                                       '  '  lbL-----

Mointenonceof the Lucimeter

The Lucimeter should olwoys be protected ogoinst dust, dirt, sond, ond humid-
ity ond should never be left lying in lhe sun. lts movoble ports ore mounted on
shockproof beorings; lhe instrument, however, must be proiected ogoinst hord
knocks.


Climote-proof?

You hove reod correctly, the Lucimeter S  is greotly protected ogoinst fem-
peroture voriotions due to o  built-in heot conductor. In the obsence of  this
electricol device it is possible thot foulty results of 1-2 stops moy be indicoted
in very low or very high temperotures. You ore now certoin thot within o ronge   '
from obout l4o to l04o F. (from -l0o C. to *40o  C.) the indicoted exposures ore
os precise os of normol temperotures, os the heot conductor compensotes for
the disturbing temperoture differences
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