Sekonic L-164C Marine Meter II User manual

2 M e r c u r y  B o i t e r Y ,

This meter  requires o  piece of  1.35 volts
m e r c u r y b o t t e r y  s u c h o s M o l l o r y P X - 1 3 ,
Evereody EPX-l 3  or equivolent.
To test fhe bottery  (or  sufficient strength,
turn the switch to "BC " ond see if the pointer
swings up to the red mork on the Guide Line
plote.  lf  it does not move to this mork,pleose
reploce the  bottery.  This tyPe  of  bottery
normolly losts for obout o yeor ond o holf .
When  you chonge the  bottery, poy  speciol
ottention to woterproofing. The bottery chom-
ber is mode woterproof by meons of O-Ring
fitted in the groove between the chomber ond
its cover. Before seoling the bottery  cover,
cleor the O-Ring from dirt,ond coot  it  with
some greose. Then, screw the cover with the
screw-driver(O-Ring greose ond screw-driver
ore ottoched in the pockoge).

2 S e t t i n g  t h e S . h u t t e r S p e e d '

To moke eosier operotion of the meter under
woter, it  is odvisoble to decide ond set the
shufter speed before diving.
By turning the time setting knob, fhe orrow
index will rotote  olong the  shutter  speed
scole. Set the orrow index ot  the  shutter
speed you wont.

VALUES OF UNNUMBERED LINES on the
shutter speed scole ore shown in the follow-
i n g  i l l u s t r o t i o n .


500(400)250(200)r25(r00)

3 R e o d i n g  t h e   f / s t o p  S c o l e ,

              Aim the meter toword the subiect ond set
                 the q/o(f   switch ot  "ON"  to  permit  the
                 polnter to move ond indicote o certoin point
               on the guide line plote.
               Then, reod the  figure on the  f/stop  scole
                 within the guide line indicoted by the pointer.
              The combinotion of this f /stop figure ond the
                 shutter speed you selected beforehond gtves
               you o correct  exposure.





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BASICMETHODSFOR COR.RECTEXPOSURE

                                                                                                            l . N e o r    i h e S u r f c c e o f W o t e r '

                                        For photogrophs to  be token  in shollow woter, i.e.
                                           3 - 4 m e t e r s ( o b o u t   l 0 - 1 3     f e e t ) d e e p , o n  e x p o s u r e
                                      element is very importont. When the sun's roys Pene-
                                                                                     t r o t e    i n t o   t h e w o t e r , t h e  s u r f o c e r i p p l e s f l i c k e r  t h e
                                                  light  to  vorious potterns. When o  picture  of  the
                                         surfoce is being token, the pointer of the meter  will
                            m o v e e r r o t i c o l l y o n d q u i c k l y  i n f l u e n c e d b y   f l i c k e r i n g
                                      on the surfoce. To determine the correct exposure
                                                                                                           i n s u c h c o s e , i t w o u l d b e b e t t e r  t o   t o k e o n o v e r o g e
                                         reoding between the moximum ond minimum volues of
                                              f/stop  indicoted by the pointer,or o reoding slightly
                                                 to minimum f rom the overoge. Since the rippling sur-
                                          foce  offects  considerobly the exposure volue, it  is
                                         importont  to oim the meter correctly occording to
                                           the picture to be token; whether or  not the woter
                                         surfoce should be included in the picture ond meter
                                       meosurln9.

2. At a Depth of  5-20 Meters:
At o depth of 5-20 meters (qbout l6-65  feet) in the woter,o situotionof  light dispersion
will be most stoble.
A proper exposurevolue con eosily be decidedby reodingthe volue indicotedby the pointer,
ond just opplyingthe reodingto the comero.
But,if you wont to toke o photo whichincludesthe surfoce ot the depth of less thon obout I O
meters,it  is very importont to tqke core of cotching the momentfor shootingwith the some
brightnessos meosuredby the meter,os in such depfh o conditionof light vories occordingto
the swell of the surfoce.

3. At o Depth of 30 Meters or More,
At o depth of 30 meters (obout 100 feet) or mor.e,thequontity of light is consideroblylow
ond the light folls olwoysstroightdown f rom the surfoce. Of course,the surfoce of woter connot
be seen,ondthere is no influencefrom the ripplingsurfoce.
Accordingly,in sucho depth underwoter,it is not porticulorlynecessoryto meosurethe brightness
in every portion of the subject. But,when you wont to toke o photogrophwith your comero
directedupwordsor downwords,it is necessoryto reod on exposurevoluerespectively.
It is odvisobleto use on electric flosh opporotusin plocesdeeper thon 40 meters (obout  | 3O
feet ).

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4 . M o t i o n P i c t u r e s '

Any of the methods for determiningexposurepreviouslyexploinedfor  still comero con be used
for moviecomero.The relotionshipbetweenthe filming speedsof moviecomeroond the shutter
speedsof  still comeroore os illustrotedbelow. Find the filming speedof your comeroond reod
the correspondingfigure on the f/stop scole. Then,you con get o correct exposurefor your
motion pictures.
            2s0      r25
for Still ,

for Movie '                t25                                                      t 8  1 6                 (fps.)                                 24
 5 . C o l o u r  P h o t o g r o p h y '

There is o problem in colour photogrophy under woter  which needs speciol ottention.  Sun roys
which enter the woter ore obsorbed with vorious rotios occording to the depth ond the frequency
o f  c o l o u r  i t s e l f . T h e  r e d d i s h r o y s w i l l b e o b s o r b e d b y 7 O - 8 0 % , e v e n    i n   t h e c l e o r w o t e r o t  o
depth of 3 meters (obout l0  feet), thot meons only 20-30%  of the reddish roys remoin in such
o depth under woter. At o depth of obout l0  meters (obout 33  feet) olmost none of  the reddish
 r o y s o r e s e n s i t i v e o n t o  t h e  f i l m .
To prevent your picture from becoming too bluish ond give o good colour effect, it would be
better to use some flosh bulds os on ouxiliory illuminotion,when you toke o colour-photo in woter
more thon 5 meters (obout l6  feet) deep.
                                                                                                                                        t 0

GENERALCAUTIONS


 l.  After  the meter hos been used in the woter, especiollyin solt woter, pleose rinse it out with
    cold  f reshwoter. Then,wipe off  the woter ond dry the meter completely,but pleose keep it
   owoy from ony heot.
2. When the meter  is not in use for long time, keep the bott6ry out of the mefer  in order  to
    ovoid possible domoge from  corrosion of the  bottery.
3.  Do not expose the meter  direct  to the sun for mony hours os on seoshore.
                               IIL'




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