PETRI GX-1 User manual

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Welcome to the exciting world of Petri .Your new camera is one of a family of professional
quality cameras designed with the serious photographer in mind. And the name Petri is your
assurance of superbly crafted optics and outstanding mechanical performance and reliability.





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ESSENTIAL SPECIFICATIONS
Type: 35mm SLR TTL match LED measurement system.
Film: Picture Size: 35mm, J135 24X36mm
Lens Mount: K type bayonet mount
Shutter: Metal focal plane shutter 1/1000 to 1 (seconds) and B.
Self-Timer: Approx. 10 seconds duration, mechanical operation.
Field of View: 93% vertical and 93o/o horjzontal coverag6 of the ictual picture field.Magnification:  '1:0.86 (with a standard 50mm lens.)
Focusing: Horizontal split-image center spot with surrounding microprism collar on mattetype fresnel screen.
Light Metering System: Open-aperture TTL metering system. Match LED, display with overand under exposure warnings.
Exposure Range: EV3-18 (ASA  j 00)
ASA of Film: ASA 25 to 1600
Synchronization Contact: X contact
Accessory Shoe: Hot ShoeFilm Advance Lever: single lever stroke with 135' throw and 30" stand-off   d&,''oeFrame Counter: Additive type with automatical resets
Film Rewinding: Rewind crank type
Mirror: Quick-return mirror
Back Cover Opening: Hinged by pulling the rewind knob up
Power Source: 2 Silver oxde b-atteries, type SR44 (G-13).  . or 2 alkaline batteries, type LR 44 (A-76).
Size and Weishr: 133X85y4gmm,  sbg (onty bodyj     (Subject to change without notice.j

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2 Loading the Battery
Two SR44 (G-13). or LR44 (4-76) batteries are employed
 for this camera.
 1. The battery chamber cover can be opened by
turning  it counterclockwise with a coin.
2. Load the batteris correctly according to the
indication of the polarities in the battery chamber.
 (lf the batteries are loaded incorrectly with the
reverse polarities, the LED in the viewfinder does
not lig ht.)                                                                                  Fig.33. Turn tightly the battery chamber cover clockwise.





                                                                                         Fig.4
Be careful not to contaminate the surface of the batteries with sweat or oil when loading
the batteries. lf contaminated batteries are loaded,  it causes an improper contact. When
the batteries are contaminated, wipe otf the dirts with dry cloth.
Unload the batteries when the camera isrot used for a long period.
The batteries should last for approximately one year under normal use. When the camerahas been used over one year, replace the www.butkus.usold batteries with new one.
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   Main Switch/Shutter Release LockB
Wh.n dep.ressing.the shutter rerease button half-waydown, main switch cornes on.
As the film advance lever is also lunctioning as
release lock, neturn the lever to its stocked "position
to avoid wasting battery power when not uiing the
camera.





                                                                                         Fig.5





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I  Loading the film
The PETRI GX-l uses color or black and white
tifm in stanOard 35mm (J135 24mmX36mm)  film.
1. Pull up the rewind knob, and pull it up stronger
Then the back cover will open.
2. Put the film into the film chamber as
indicated in the photograph, and press down the
rewind shaft to the original poqition while rotating
the rewind knob.                                                                         Fig.6 3. Insert the film leader into the groove of the spool,
and engage the perforations of the film in the teeth
of the spool.
                                                                                                                                       f ilm around4. furn the  f ilm advance lever and wind the
the take-up spool makihg sure that the perforations of
the film are engaged in the teeth of the sprocket





                             www.butkus.usFig.7                                      Fig.8
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 5. Close the back cover and press  it strongly, and
 it will be automatically locked. Tilt up the  f ilm rewind
crank, and gently turn it in the direction of the arrow
 until  it stops to take up the  f ilm slack.



                                                                                           Fig.9

6. Advance the  f ilm a cou ple of times pressing the
shutter button until the first exposure position (1  )
in the middle between 0 and 2 appears in the frame
counter. The  f ilm is properly loaded  if the  f ilm
rewind knob rotates cou nterclockwise when the
 f ilm advance lever is operated.

                                                                                      Fig.1O
In case there is a film slack after the film is taken up on the spool, turn the tilm rewind crank
in the direction of the arrow to obtain proper film tautness, and then close the back cover.Avoid direct sunlight when loading the film.
When pressing the shutter button, pull the film advance lever.  lf the film advance lever  is
pushed to its stocked position, the shutter buttoh will be locked.
Accordingly, the shutter is not operated'in this state.


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    Setting the ASA Film Speed5
 After loading the film set the ASA  f ilm
 speed according to the ASA speed of the film in use. (The ASA rating recommended              h by the manufacturer is printed on the film       6P                                                                                                                                                                                    to'oO box, e.g. ASA.  . .) When using the  f ilm of
 ASAl 00,  f cir exam ple, set the position 1 00
 of the film speed setting dial to the film speed
 sca   I e.                                                                  o
The dial number of the  f ilm ASA is as                                                                           Ao indicated, and there are clicks corresponding
to the respective numbers.
                                                               ooz



                                                                          Fig.12



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6  Setting the Shutter Speed
1. Turn the shutter speed dial in either directlon
until the desired number clicks into place on the
white line of the body.
2. Accurate shutter 9p9ed cannot be obtained by thein-between setting of the shutter speed dial. set ihe
shutter speed so that the desired num ber clicks into
place.
At the "B" setting, the exposure meter cannot be used.
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7  Setting the Exposure
Your PETRI GX-l has a built-in LED system,             5. When the red warning lamp (-)  lights,  it is
which measures the light coming through the         meaning of Under-exposure. In this case
lens and enables you to set the proper                 the diaphragm ring of the camera lens should
exposure for a given lighting condition.              be turned counter-clockwise or the shutter
Two sensitive cadmium Sulfidc (CdS) cells,           speed dial should be turned to a slower
installed beside the eyepiece, read the light in         speed until the green LFP lights.
the overall picture area and particularly the           6. The proper exposure of film is obtained
center weighted. This is very important in            whenever the green LED lights.
obtaining accurate exposure readings in
scenes where there is an over-aboundance
of sky in the background o.r,,where
backlighting or sidelighting is present.
To take an exposure reading:
1. Winding of the Film Advance lever.
2. Switch the meter on by gently pressing the
   shutter release button half -way,down.3. When one of the LEQ,s locatbd at left side                ffi
   of the viewfinder lights, the meter circuit
   is powered by batteries.
4. When the red warning light (*) lights it is
  meaning of Over-exposure. In this case the
  diaphragm ring of the camera lens should
  be turned clockwise or the shutter speed                                       Fig.14
   dial should be turned to a higher speed
   until the green LED lights.         www.butkus.us
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8  Holding the camera
1. Rest the camera on your left palm so as to turn the
   lens focusing ring with fingers.
2. Hold the camera body lightly, with your right
  forefinger lightly on the shutter button
3. Press your left elbow lightly against your body an
  look into the viewfinder steadying the camera
  against your face. The right arm should be relaxe
  while holding the cam era.
  Use the tripod when you use telephoto lenses or
  slow shutter speqds.

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                                                                            Fig.16

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              Camera0  Focusing the
Focusing  is taken from the small round area in the
centre of the view-finder screen. The inner circle is
a split image range-finder and is surrounded by a
microprism. The split-image range-finder divides the
image horizontally. When the two halves are brought
into exact alinement, correct focusing has been
obtained. The outer rnicroprism conveys a broken,shimmering image when out of focus and becomes            fficlear and sharp when correct focus is reached.


                                                                           Fig.17





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                                          ln focus                           Not in focus

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 f O Releasing the Shutter
 When you press the shutter button, the
 aperture is throttled and the shutter screen
 is opend to allow the film to be exposed.





                                                                           Fig.2O

lf the shutter speed is slower than 1/30 second, camera shake tends to occur. Hold
securely the camera in this state, and press the shutter button slowlv.
It is recommended  to use the tripod and the cable release when using a slow shutter speed.
When using the tripqC, nevdr forcibly screw the long legs at the threaded portions. lt will
cause a trouble. (Use,the tripod of the screw of S.7mm long (5.5mm in the JIS).)
Never move the_shutter speed dial while depressing the shutter button and operating the
shutter.  lt will affect the accurate shutter speed and the correct exposure of the film.-





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 ll  REwTNDTNG rHE FILM
To rewind the fifm after the last exposure:
 1. Press the film rewind button untif  it is locked in the
depressed state.
2. Tilt up the rewind crank and turn in the direction
of the arrow.
3. When the film is completely rewound the rewind
knob will suddenly turn very easily.
4. Pull the rewind knob against the resistance to
open the back.                                                                        Fig.215. Take out the film.
6. Press the rewind knoq down and close the back
cover.





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                                                                                      Fig.22
Note
Avoid direct sunlight when unloading or loading the   f ilm. lf the film advance lever stops
midway and the film rewind button will npt remain in the depressed state, then rewind the
film while keeping the rewind button depiessed with your finger.Never open the back
cover until the  f ilm is completely rewound.www.butkus.us
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        "B" (Butb) seninstp ne
At the "8" setting, the shutter remains open while the shutter button is depressed to expose
the film. Use the "8" setting to take night scene, etc.
At the "8" (bulb) setting, use the tripod, cable release, etc.





                                                                          Fig.23
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tB  Taking with the Self-Timer
The self-timer is used for selfportraits and allowing
 yourself to inclgde in the photograph when desired.
 1. Push the film advance lever, and fully turn the self-
timer lever counterclockwise as indicated on the
 picture.
 2. W hen pressing the shutter button, the self -timer is
 operated, and the shutter will be released approx. 10
seconds later.
 lf Vou once set the self -timer, you cannot cancel the                                    Fis.24 seit-timer 6peiafibn. $et tl're self-timer only when you
 desire the self-timer oPeiation.
When the self-timer lever is fully turned, the shutter will
 be released approx. 10 seconds later.


     Flash Photosrafhv11
1. When using the flash unit, you can use the flash only
by inserting the flash into the hot shoe.
2, Set the shutter speed dial at 1/125 sr longer

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                                                                 Fig.25             Fis.26
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                           - Field16 Depth-of
When the camera is focused at certain distance. there
are the ranges for taking the subjects clearly in the
picture on both sides of the distance. This ranges are
called the "depth-of-field'.'
There are following relationships in the depth of field:
1. When the aperture is reduced (2 to 16), the depth
of field is increased to increase the ranges for taking
the scene clearly in the picture.
2. W hen taking farther scene, lhe depth of  f ield is
increased longer.
3 Wider angle lens of short focal length provides longer
depth of  f ield                                                                    Fig.274. f he rear range   f rom the  f ocused distance of the
camera provides longer deBth of  f ield than the  f ront
range from the distance.
You can know the depth of field as below.
1 . A depth-of-field scale is eQgraved on the respective lenses. When the camera  is, for exam ple,
focused on a subjectat the distance, e.9., 3m with the aperture set at f/8, the subjects
located within 8 at both sides of the "l" mark (approx. 2m in the front range and approx. 5m
in the rear range) are sharp and clear.





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16 INFRARED RAY MARK
The short red line on one side of the datum mark is
the inf ra-red ray rndrk, which is used to correct the
focusing when'using infra-red film and filters. The
 infra-red ray has a longer wave length than the
visible light range, therefore, the fodusing is displaced
 being indicated by a short red line.
InfeRed PhotograPhy
 1 . Attach an inf ra-r'ed filter to the camera.
 2. Focus the lens using the red line.
 3. Set the exposure accqrding to the description on
 the  f ilm and release the shutter.
 It is probable is imposible to focus the camera
 with'the inf ra-red   f ilter in position. Either focus with
the  f ilter removed and then replace  it or use the                                          Fig.28
 distance scale.



                                                                                      Fig.29

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17 cHANGTNG AND REMovTNG rHE LENs
Depress the lens release button and turn the lens
counter-clockwise until it stops. The lens will now
move  f reely from the body.
Fitting the lens
Match the red point on the camera body with the red
point on the lens barrel. Fit the lens to the camera
and turn it clockwise until it locks into position.
The Bayonet Mount
Your PETRI GX-1 camera is equipped with a "K" type
 bayonbt mount and will accept all lenses with this                                   Fig.30
 f ittin g  .


Note
Be sure to lock the lens completely. lf the shutter is
released and the lens is not locked into position an
accurate exposure can not be obtained.



                                                                                     Fig.31



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CARE OF THE CAMERA AND MAINTENANCE
1 . Under no circumstances touch the lens
with the hand, use a blower brush or lens
cleaning tissues to remove dirt or grease.
2. Shock, moisture,  salt, sand, etc. can cause
damage to your cam era.  lf you must take
yorrr PFTRI GX-1 camera onto the beach
remember that sand gets everywhere so keep
the camera well wrapped up and in a clean
sealed bag when not in use.
3. Avoid putting the camera anywhere when
strong sunlight would cause an abnormally
high temperature eg. on the back shelf or on
the seat of a parked car.
4. When storing the cam era remove the
battery and keep the camera in its case.
Store in a dry place.
5. lf the cam6r'a is to be stored for extended
periods take  it out periodically"and  operate
it a few times.                 't
6. Avoid storing the camera where abrupt
tem perature changes take place.


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