Chinon 900c Flash User manual

CONTROLS
1. 3 positaon switch           a.  Test button
2. Auto sensor eye            9.  Battery compartment lid
3. Flash window           1O. Flash guide dial scale
4. Hot shoe contact         11. Shoe lock screw
5. Flash Bounce angle      L2- P. C. Cord socket
    indicator                  13. Flash shoe base
6. Ready lamp               14. PC connecting cord
7.  On,/off switch
S P E C I F I C A T I O N
Guide number:      50 in Jeet ASA25
Colour temperature: Daylight (57OO" Kelvin)
Coverage field:      F8 setting 3-12 feet (ASAfOO)
                  F4 setting 4-25 feet (ASAIOO)
Coverage angle:     Horizontal 60"   Vertical 45"
Flash duration:     L/IOOO sec - Manual setting
                 I/3OOOO- l/IOOO sec - Automatic
                        sett i ng
Recycling time:      Approx.10 secs.
Power Source:      4x 1.5V AA type Alkaline batteries
Battery  life:         Approx.l2O flashes - Manual setting

BATTERYINSTATLATION
Slide open the battery compartment  lid and insert four
AA alkaline l.5V  batteries making sure they  are  cor-
 rectly positioned according to the diagram  in  the  bat-
 tery compartment.
 Batteries should be removed as soon as  they become
weak, or  if  unit  is not to be used for a time, to prevent
danger ol corrosion from  battery leakage.
NOTE:  lf the batteries are not  inserted properly, this
 flash will not operate.
The batteries should be replaced when the recycling time
exceeds 30 seconds or when no sound can  be  heard
when the unit  is switched on. lt  is a good idea to clean
periodically both ends ot the batteries and contacts  in-
side the battery compartment with a pencil eraser.

CHARGINGTHE CAPACITOR
When the unit is new and after  it has not been used for
 a tame the capacitor will take slightly longer to charge.
ATTACHINGYOUR FTASHTO THE CAMERA
Rotate the locking ring in a clockwise direction.  Push
the unit onto the accessory shoe of  the camera  and
rotate the ring anti-clockwise to lock the flash securely
to the camera.
 lf your camera has a hot shoe, it  is  not  necessary  to
use the detachable PC cord supplied with your flash.
Once attached to the camera, the tlash  is electronically
connected with the camera through the contacts  in  the
shoe.   lf  your camera does  not  have a  hot  shoe, plug
the pointed end of  the detachable PC cord  into  the PC
cord socket on the shoe base.  Plug  the  other  end  of
t h e c o r d  i n t o  t h e c a m e r a  t l a s h  t e r m i n a l m a r k e d ' X ' .
Refer to  your camera  instruction manual  for  specific
inform ation.

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SHUTTERSPEEDSETTING
                 'X'Provided the     setting is selected, any shutter speed
can be used on cameras having leaf-type shutters, though
a speed of  1/l25th  second is recommended. Cameras
with a focal plane shutter usually have an  'X'  shutter
setting. Usually this has a speed of  l/60th  second or
l/125th  second. See your camera instruction manual tor
detaiI s.
TODE SELECTOR
The Mode Selector on the Prinz-9O0C Flash unit can
be set  to  three  positions  allowing  you  to   select
"MANUAL" operation or one ol two automatic settings:
TANUAL - Set the sliding knob on  front  of  the  unit  to
lett position (under the WHITE dot).  In  this  position
your flash will operate in the manual mode.
AUTOTNATICilODE-When used for automatic flash photo-
graphy, the unit's  light output  varies according to  the
FLASH-TO-SUBJECTDISTANCE and  reflectivity  of
subject. Two different automatic settings are provided
to give you  control over  the  depth  ot  field   in  your
photographs.
       G R E E N  - U t i l i z e s r e l a t i v e s m a l l    l e n s o o e n -
                      ings  for the gretest  depth ot  field.
                   Automatic operating range:3  to 12
                                          f e e t   ( l   t o 3 . 7 m )
       ORANGE - Utilizes  larger  lens  openings for
                       relatively shallow depth of  field.
                    Automatic  operating rcnge: 4 to 25
                                          f e e t   ( 1 . 3 t o 7 . 5 m )

OPERATINGINSTRUCTIONS
                                'ON'position.Slide the on-off switch to the            A humming
noise will be heard, which  will become fainter  as  the
unit  is  fully charged.
The ready  indicator lamp  will  glow  to  show  unit  is
ready lor operation.
  The unit  can  be discharged by  pressang the  test
 button.
  Always ensure that the unit  is switched off  after use
to save battery consumption and to preserve the  lite of
untI.
FTASHOPERATION-  If,anualUse
Set the knob on front  of unit to Left position.  ln  this
position your flash will operate in the manual mode.
  Set the  rotating  disc on the back of the  unit  in such
a position  that  the speed of  the film  being used appears
adjacent the diamond  mark   (e. g. ASA l0O  in Fig.3)
  Estimate   (or  measure  for  greater  accuracy)  the
camera to subject distance and then locate the nearest
greater reading in feet or metres on the top semi-cir-
cle of the disc.
  Read the adjacent  white  figure on the  inner  disc  to
determine the camera lens aperture setting  (e. g. f5.6
for a distance of say 15ft). Note that the  readings on
the outer disc are  the maximum  distances  at  which
photographs taken  at  the adjacent   f  stop  reading  will
be correctly  exposed.  Ensure  that  phographs  are  not
taken out of the effective range as they will be under-
exposeo.





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FLASHOPERATION- ComputerUse
The  built-in  photosensitive  cell  measures  the  light
emanating from  the  subject and  the. computer  auto-
matically determines the correct quantity  of  light  re-
quired. There are two settings for  computer  use  -  (a)
for relatively close range when the  white  knob should
be set under the  green dot  (Fig.4) and  (b) for great-
er  distances  when  the  white  knob should be  slid
under the orange dot  (Fig.5)
  With the disc at the back set at the appropriate film
speed e. g. 1OO ASA in Fig. 5 one can choose  either    f 8
setting as indicated by the green arrow or f4  as  indi-
cated by the orange arrow. The figure within the arrows
specifies the maximum distance at  which photographs
at that oarticular aperture can be taken.  12{t  is  the
maximum  distance specified in the green arrow. There-
fore for distances of 12ft or less the green setting  (a)
should be selected and the camera lens should be  set
at  f8  stop.
For distances in excess of  12ft but less than 25ft  the
orange setting  (b) should be selected and the camera
lens should be set at f4  stoo.
  As can be seen in Fig.7 when 25 ASA Film  is  to  be
used the green setting  (a)  for  distances up  to   l2ft
corresponds to  f4  setting, while orange setting  (b)  for
distances up to 25ft  corresponds to  i2  setting. Should
the film  speed  (e. g. ASA 64) be such  that  the  green
arrow falls between two  J  stop  readings choose the
nearest white  figure  to the right of  the arrow  (e. g. J
5 . 6 ) .

ADJUSTABTEBOUNCE
The angle of flash can be elevated trom  horizontal po-
sition for conventional flash photography to vertical po-
sition for reflected flash by  turning the head of  flash
body. (Fig. 8, 9).  The  light  is  reflected  satisfactorily
provided that the ceiling  is  flat-surfaced,  or  average
height and not of a dark, non-reflective colour. The bene-
 fit  of reflected light  is that  it results in soft, shadow-
less photographs.
  The comuter functions normally in bounce Jlash photo
graphy. However, the  total  flash  to  subject distance
should be calculated and the appropriate lens aperture
se I ected.
  Refer to Fig.6 where film  speed setting  is  at  100
ASA. The orange arrow points  to  f4  setting  tot   L2tt
maximum  range. For vertical bounce photography up to
this distance the camera lens should be set at aperture
 f 4   ( i n  t h i s e x a m p l e ) .
DETACHEDOPERATION
 It  is possible to use the  flashunit detached from  the
camera for  flashlight  reflection from  vertical  objects
such as a wall. The Jlashunit should be connected  to
                   'X'the camera's    socket using the P.C. cord-
Warning: lt  is important, when using bounce flash or the
unit detached from  the camera, to ensure that the total
flash to subiect distance is taken  into account, other-
wise photographs will be underexposed.
 It the flashunit is being used detached from  the camera,
 it should always be held in such a way  that   it   is  at
 right angles (90")  to the camera.    lf    it   is employed
 whilst  in the same horizontal or  vertical plane as  the
 X camera or at an obscure angle, it may  be  that  the
 direct  or  reflected  light  does  not  provide  sufficient


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gOOCCHINON

coverage to expose the whole subiect appearing in  the
viewfinder. Under-exposedportions may then appear in
the photograph.

PRECAUTIONS
 l.  Should the unit  tail  to operate for any reason other
   than depleted batteries please refer to qualified ser-
   vace personnel. A  high  voltage capacitor  is  incor-
   porated in the unit.
2. Remove the batteries  if the unit  is not  in  use  for
   any period exceeding say 2 o( 3 weeks.
3. Keep the unit dry and store in a  moisture-free  en-
    vi ronm ent.
4. When photographing outdoors or  in a large room  or
    hall where there are no effective reflecting surfaces
   nearby, it  is necessary to set the camera lens at  a
   wider aperture than that  indicated  in  the  exposure
       t a b l e  ( l  o r 2  f  s t o p s , .

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we may change specitications without prior notice.