Tektronix C-30B User manual

Ttektronix
COMMITTED TO EXCELLENCE
C - 3 0 B
C A M E R A
INSTRUCTION MANUAL
Tektronix, Inc.
P.O. Box 500
Beaverton, Oregon 97077 Serial N u m b e r
----------------------------------
070-2825-00 F ir s t P rin tin g , J U N 1 9 7 9

WARRANTY
Tektronix warrants thatthis product isfreefrom defects in materials
and workmanship. Thewarranty period is one (1) yearfromthedate
of shipment. Tektronix will, at its Option, repair or replace the
product if Tektronix determines it is defective within the warranty
period and if it is returned, freight prepaid, to a Service center
designated by Tektronix.
Tektronix is not obligated to furnish Service under this warranty
a. to repair damage resulting from attempts by personnel other
than Tektronix representatives to install, repair, orservicethe
product;
b. to repair damage resulting from improper use or from
connecting the product to incompatible equipment;
c. if personnel other than Tektronix representatives modify the
hardware or Software.
There is no implied warranty of fitness for a particular purpose.
Tektronix is not liable for consequential damages.
Copyright © 1979 Tektronix, Inc. All rights reserved.
Contents of this publication may not be reproduced in any
form without the written permission of Tektronix, Inc.
Products of Tektronix, Inc. and its subsidiaries are
covered by U.S. and foreign patents and/or pending
Patents.
TEKTRONIX, TEK, SCOPE-MOBILE, and f ^ t are reg-
istered trademarks of Tektronix, Inc.
Printed in U.S.A. Specification and price change
Privileges are reserved.

C-30B Camera
TABLE OF CONTENTS
Page
LISTO F ILLUSTR A TIO N S
........................ ii
LIST OF TABLES ........................................ iii
SECTION 1 GENERAL INFORMATION
IN TRODUCTIO N
................................. 1-1
S P EC IF IC A T IO N ................................. 1-1
SECTION 2 OPERATING INSTRUCTIONS
DESCRIPTION OF CONTROLS
AND CONNECTORS ................................. 2-1
PREPARATION FOR USE ....................... 2-3
MOUNTING THE C A M ERA ............... 2-3
Light Seal Replacem ent .................. 2-3
Camera M o u n tin g ............................ 2-3
IN STALLING CAMERA BACKS. . . 2-4
USING THE POLAROID PACK
FILM BACK ........................................... 2-5
Focusing ........................................... 2-5
Installing the Pack F ilm .................. 2-6
Advancing and Developing the
Pack F ilm .........................................2-7
USING THE POLAROID ROLL-FILM
B A C K ..................................................... 2-8
Focusing
........................................... 2-8
Installing the Roll Film .................... 2-9
Advancing and Developing the
Roll Film ........................................... 2-9
USING THE GRAFLOK BAC K____2-10
Focusing
......................................... 2-10
Installing Loaded Film Holders . .2-10
PHOTOGRAPHIC CONSIDERATIONS.2-11
WRITING RATE ................................. 2-11
CRT SELECTION ............................... 2-11
FILM SE LECTIO N .............................2-12
HELPFUL TECHNIQUES WITH
F I L M ................................................... 2-13
Polaroid F ilm ..................................2-13
Conventional Film .......................... 2-14
PICTURE T A K IN G ............................ 2-15
Photographing Repetitive Signals .2-15
Photographing Single-Sweep
Displays............................................2-15
Page
SECTION 2 OPERATING INSTRUCTIONS (cont)
PICTURE TROUBLE..........................2-15
Wide Trace ...................................... 2-15
No Image on P ic tu re .....................2-15
Light Streaks on Picture................2-16
Fogging on Picture..........................2-16
Trace or External Graticule in Focus,
But Not B o th
................................. 2-16
Some Portions of Photographed Signal
Appear Brighter Than Others. . . .2-16
ELIMINATIN G PARALLAX AND
FOCUSING DIFFIC U L TIE S
............. 2-16
First M e th o d ................................. 2-16
Second M ethod...............................2-16
EFFECTS OF THE f-STOP SETTING
ON THE DEPTH OF F IE L D
............. 2-16
EFFECTS OF CAMERA
MAGNIFICATION ON
EXPOSURE.........................................2-17
RECIPROCITY
.................................... 2-17
SECTION 3 MAINTENANCE
GENERAL CARE OF THE CAMERA
SYSTEM
..................................................... 3-1
L EN S E S ................................................ 3-1
SH U TTER ............................................. 3-1
CAMERA BACK R OLLER S ............... 3-1
LIGHT L E A K S E A L IN G .................... 3-1
MAGNIFICATION ADJUSTMENTS. . . 3-2
COMPONENT REPLA C E M ENT .......... 3-3
REPLACEMENT PA R TS .................... 3-3
INSTRUMENT REPACKAGING . . . 3-3
Required Reshipment Information .3-3
SECTION 4 OPTIONS
OPTION 1 ................................................4-1
SECTION 5 REPLACEABLE MECHANICAL PARTS
CHANGE INFORMATION
l

C-30B Camera
LIST OF ILLUSTRATIONS
Figure IMo. Page
The C-30B Camera.........................................iv
1- 1 Dimensional drawing w ith a Polaroid pack
film back attached.......................................1-3
2- 1 Camera Controls and connectors ................ 2-2
2-2 Mounting the camera and inserting the
light seal ....................................................... 2-3
2-3 Mounting the pack-film back to the
camera..........................................................2-4
2-4 Installing and using the focus plate in
in the pack-film back .................................. 2-5
2-5 Installing the pack-film ................................ 2-6
2-6 Developing the pack-film.............................2-7
2-7 Opening the roll-film back
.......................... 2-8
2-8 Installing and using the focus plate in
the roll-film back.........................................2-8
2-9 View hood attached to the Graflok
back............................................................2-10
2-10 Installing the 4- by 5-inch cut film holder
in the Graflok back...................................2-10
2-11 Single trace o f a damped waveform. . . .2-11
2-12 Using transillumination to see otherwise
invisible Inform ation.................................2-14
2- 13 Depth of field for different aperture
settings
....................................................... 2-17
3- 1 Sleeve lock collar location .......................... 3-2
II

C-30B Camera
LIST OF TABLES
Table No. Page
1-1 Optical Characteristics ................................ 1-1
1-2 Electrical and Mechanical
Characteristics ........................................... 1-2
1-3 Environmental Characteristics....................1-2
1- 4 Physical Characteristics ................................ 1-2
2- 1 Commonly-used Phosphors
...................... 2-12
2-2 Commonly-used Polaroid Film for the
C-30B Camera............................................2-13

C-30B Camera
The C-30B Camera.
IV @

Section 1— C-30B Camera
GENERAL INFORMATION
INTRODUCTION
The TEKTRON IX C-30B is a compact, variable-
magnification, general-purpose camera designed primarily
fo r photographing TEKTR ONIX 400-series oscilloscope
traces and monitor displays. Its lens magnification is
manually variable from 0.7 to 1.5 in 10 Steps. Three inter-
changeable camera backs can be accommodated by the
C-30B Camera: a Polaroid Pack-Film back, a Polaroid
Roll-Film back, and a 4- by 5-inch Graflok back. When the
camera is mounted on the test instrument, dual swing-away
hinges allow the camera to be swung out of the way, either
to the left or to the right, for direct viewing of the crt
display.
The C-30B Camera is delivered with two light seals, one
for the 8- by 10-division crt and the other for the 6- by
10-division crt. The 8- by 10-division light seal comes
inserted in the mounting adapter and is used with TEK
TRONIX 422, 453A, 454A, 485, and 491 instruments. The
6- by 10-division light seal is used w ith TEKTRON IX 453
and 454 instruments.
SPECIFICATION
The Standard C-30B Camera is shipped w ith an adapter
that can mount directly to a TEKTR ONIX 422, 450-series
(except 455), 485, or 491 instrument. A listing of other
camera adapters and the equipment for which they are used
is found in the tabbed Accessories page at the rear of this
manual.
The optical characteristics presented in Table 1-1 are
valid only if the camera has been operating at an ambient
temperature between 0° and +50° C (+32° to +122° F).
Electrical and mechanical, environmental, and physical
characteristics of the camera are listed in Tables 1-2, 1-3,
and 1-4 respectively.
Table 1-1
Optical Characteristics
Characteristics Performance Requirements
Lens
Maximum Relative Aperture at Infinity f/1.9.
Focal Length 56 mm nominal.
Coverage at Maximum Relative Aperture A t least 120 mm diameter in object plane.
Magnification (Object-to-lmage Ratio) 1:1.5, 1:1.4, 1:1.3, 1:1.2, 1:1.1, 1:1, 1:0.9, 1:0.85, 1:0.8, and
1:0.7 ±5%.
Geometrical Distortion Not more than 0.2% as measured at 1:1.1 magnification.
Not more than 0.75% as measured at 1:1.4 magnification and at
1:0.8 magnification.
Relative Illumination 20% at 120 mm diameter w ith a relative aperture of f/1.9.
Photographie Resolving Power at 1:1
Magnification
Center Pattern A t least 25 lines/mm, w ith USAF target pattem 1951 on Plus X
pan film , developed in 1:1 DK 50 fo r 6 minutes at 20° C.
A t 120 mm Diameter A t least 10 lines/mm, with USAF target pattern 1951 on Plus X
pan film , developed in 1:1 DK50 for 6 minutes at 20° C.
1-1

General Inform ation—C-30B Camera
Table 1-2
Electrical and Mechanical Characteristics
Characteristics Performance Requirements
Maximum X Sync Contact Rating 28 V de, 750 mA (Common is connected to case of camera).
Shutter
Speed (Normal) Range 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, and 1/125 second.
Accuracy DIN 19015.
Relative Aperture (f-Number) Range f/1 .9, 2.8,4, 5.6, 8, 11, and 16.
Accuracy ±1/3 of aperture (f) setting.
Synchronization Internal; X type as describe in 3.1 of U.S.A. Standard PH
18-1957.
Table 1-3
Characteristics
Environmental Characteristics
Description
Temperature
Operating 0° to +50° C (+32° to +122° F).
Storage -5 5 ° to +75° C (-6 7 ° to+167 ° F).
Relative Hum idity
Operating 75% at +50° C.
Altitude
Operating To 15,000 f t (4,500 m).
Storage To 50,000 ft (15,000 m).
Vibration 15 minutes along each of the three major axes at a total displacement of 0.025 inch p-p with
frequency varied from 10 to 55 to 10 Hz in one-minute sweeps, held fo r ten minutes at each
resonant point, or if none, at 55 Hz.
Shock Three shocks at 50 g, half-sine, 10-ms duration in each direction along each major axis, for a
total of 18 shocks.
T ransportation Qualifies under National Safe Transit Committee Preshipment Test Procedures 1A-B-1 and 2.
Table 1-4
Physical Characteristics
Characteristics Description
Weight (with adapter mounted, no film back) 3.25 Ib (1.47 kg).
Length, Width, and Height (with Polaroid
Pack-Film back)
See Figure 1-1.
*
1-2 REV A FEB 1980

General Information—C-30B Camera
Figure 1-1. Dimensional drawing with a Polaroid pack-film back attached.
@1-3

Section 2—C-30B Camera
OPERATING INSTRUCTIONS
This section of the manual is intended to familiarize the
operator with use of the C-30B Camera to record crt traces.
Included is a description of Controls and connectors,
Information fo r mounting the camera to the instrument,
focusing instructions, film loading, and development In
form ation, Photographie techniques, film selection cri-
teria, and additional useful operating Information.
The C-30B Camera is shipped in a carton along with its
Standard accessories. A t installation time, save the shipping
carton and packaging materials for reuse should reshipment
become necessary. Refer to the end of the Maintenance
section for repackaging instructions.
DESCRIPTION OF CONTROLS AND CONNECTORS
Refer to Figure 2-1 for location of camera Controls and
connectors.
FOCUS—This control adjusts the distance from the
front of the camera lens to the display being photo-
graphed and is used for focus alignment.
^ 2 ^ FOCUS LOCK—Locks the FOCUS knob to a partic-
ular adjustment to prevent accidental changing of
camera focus.
f-STOP (Aperture)—This control provides for con-
tinuous adjustment o f the size of the lens opening. It
is calibrated in seven f-stops from 16 to 1.9, with f/16
being the smallest aperture opening and f/1.9 the
largest aperture opening.
4J SPEED (Shutter) —This selector Controls the time
period th at the shutter remains open to admit light
fo r exposing the film . There are eight selectable
shutter speeds ranging from 1/125 to 1 second. In the
B (bulb) Position the shutter remains open as long as
the shutter button is held down, and the shutter
closes when the shutter button is released. In the T
(time) Position the shutter opens when the shutter
button is first pushed down and w ill remain open
until the shutter button is pushed down the second
time.
5j Shutter Button—This button actuates the camera
shutter when pushed down. The threaded center of
the button permits installation of an ASA internal
cable release for remote mechanical actuation o f the
camera shutter. Refer to the tabbed Accessories page
in the rear of the manual for the cable release
actuator part number.
6J Object-to-Image Scale and Magnification Index
Button—To change magnification, push and hold in
the Magnification Index button while sliding the
shutter housing along its sleeve. When the desired
object-to-image number appears in the window,
release the Magnification Index button and slightly
move the shutter housing until it engages the detent
for the desired object-to-image number. When setting
the camera for an object-to-image ratio of 1:0.85, the
numerals 0.85 w ill not appear in the window; instead,
a diamond-shaped symbol will appear.
7J X Sync Output Terminals—These two terminals are
used to slave external equipment to the Operation of
the shutter. They are connected to a mechanical
switch which is part of the shutter assembly. The
continuity between terminals represents switch
closure during the time that the shutter is open. A
commercial two-connector X Sync cable, provided
by the users, is required. The COMMON terminal is
directly connected to the camera case.
Dark Slide—The dark slide is installed to prevent
exposing unused film when the camera back is
removed from the camera. A dark slide is furnished
with both the Polaroid Roll- and Pack-Film backs.
For the Graflok back, the dark slide may be part of
the film holder used w ith the Graflok back.
REV A FEB 1980 2-1

Operating Instructions—C-30B Camera
Figure 2-1. Camera Controls and connectors.
2-2 @

Operating Instructions—C-30B Camera
PREPARATION FOR USE
MOUNTING THE CAMERA
The follow ing mounting instructions are applicable for
attaching the C-30B Camera and adapter to TEKTRONIX
422, 450-series (except 455), 485, and 491 instruments.
Various mounting adapters are available fo r other Tek
tronix instruments and may be ordered as required. Data
Sheets provided w ith other camera adapters contain
appropriate mounting information.
Light Seal Replacement
The C-30B Camera is shipped with the 8- by 10-division
light seal installed in the mounting adapter. If a 6- by 10-
division light seal is required, unscrew and remove the
rubber fo o t from the mounting adapter (see Figure 2-2).
Remove the 8- by 10-division light seal and replace it with
the 6- by 10-division light seal. Reinstall the rubber fo ot to
secure the light seal in place. For most photographic
work, any mesh filte r or colored light filter should be
removed from the instrument.
Camera Mounting
The camera with attached adapter can be mounted to
the instrument by sliding it onto the flange of the crt bezel.
To remove the assembly, slide it up and o ff of the flange of
the crt bezel.
Figure 2-2. Mounting the camera and inserting the light seal.
2-3

Operating Instructions—C-30B Camera
Once it is mounted, the camera can be swung away from
its adapter, to either side, by lifting the hinge pin on the
opposite side. The camera may be total ly removed from its
adapter by first lifting one pin, swinging the camera to one
side, then lifting the other pin. The adapter may also be de-
tached from the camera by lifting both hinge pins
simultaneously.
A slide on the adapter has been incorporated to provide
fo r easy camera mounting and removal. If a more secure
attachment is needed, tighten the two set screws (mounting
lock adjustments) located in the half-round boss on each
side o f the adapter next to the light seal groove. Use a
5/64-inch hexagonal wrench fo r this purpose. To obtain
access to the two set screws, swing the camera away from
the adapter or remove the camera completely. These screws
need only be lightly tightened clockwise to lock the adapter
onto the oscilloscope bezel. To remove the adapter from
the bezel, loosen both set screws by turning them counter-
clockwise until the adapter is free to slide off.
NOTE
To ensure that the hinge pins w ill remain engaged in
the camera adapter when moving the instrument and
attached camera about, install a thumb screw into the
bottom o f each hinge pin after mounting the camera.
Before either or both camera hinge pins can be lifte d
fo r swinging the camera out o r removing i t from the
adapter, the thumb screws must be completely
removed.
INSTALLING CAMERA BACKS
The choice of a camera back w ill depend primarily on
the intended use for the Photograph, how quickly you want
finished photographs, the area you wish to photograph, the
magnification factor of the lens, and the size of the picture
image desired.
Mounting procedures fo r each type o f camera back
(Pack-Film, Roll-Film, and Graflok) are identical. Use the
following procedure to attach your camera back to the
C-30B. Figure 2-3 shows the example of a Pack-Film back
being mounted to the camera main frame.
1. Release the camera back latch by rotating it clock
wise.
2. T ilt the camera back as shown in Figure 2-3 until the
groove at its bottom is directly over the adapter clip
on the main frame.
3. Push the top of the camera back forward until it
snaps into place against the main frame.
4. Holding the camera back firm ly against the main
frame, rotate the camera back latch counterclock-
wise to secure the camera back.
5. To remove the camera back, release the latch by
rotating it clockwise. T ilt the top of the camera back,
then pull it out.
PACK FILM
BACK
2 8 2 5 -0 9
Figure 2-3. Mounting the pack-film back to the camera.
2-4

Operating Instructions—C-30B Camera
n
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USING THE POLAROID
PACK FILM BACK
Focusing
The following procedure describes how to focus the
camera using the focus plate with a Pack-Film back.
1. Obtain a properly-adjusted trace on the crt.
2. Open the camera back by releasing the door latch and
insert the focus plate where the pack film would
normally be placed as shown in Figure 2-4(A).
3. Orient the frosted side of the focus plate towards the
crt, inserting the left side under the door hinge and
down next to the exposure window. The haif-circle
cutout in the plate provides a finger hole for easy
removal of the focus plate.
4. Set the aperture for maximum opening (f/1 .9) and set
the SPEED selector to T. With the shutter open, you
should observe the display on the biprism of the
focus plate.
NOTE
Either the c rt horizontal trace or the internal
graticule line may be used to ad just focus.
5. Release the FOCUS LOCK knob and adjust the
FOCUS knob until the trace (or graticule line) is
aligned w ith itself. Refer to Figure 2-4(B) for an
example o f an in-focus display.
BIPRISM FOCUS HALF-CIRCLE
SPOT PLATE CUTOU T
A .FOCUS PLATE INSTALLED
ON PACK FIL M CAM ERA BACK.
OU T OF-FOCUS
DISPLAY
IN-FOCUS
DISPLAY
B. CENTER OF SPLIT IMAGE
FOCUS PLATE
2 8 2 5 -0 6
Figure 2-4. Installing and using the focus plate in the pack-film back.
6. Tighten the FOCUS LOCK knob to ensure that the
focus setting cannot be changed accidentially.
i
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r~ 2-5

Operating Instructions—C-30B Camera
Installing the Pack Film
The following procedure, when used w ith Figure 2-5,
describes how to install the pack film .
1. Release the door latch and open the film door.
2. Remove the empty film Container (if applicable) by
lifting up on the pack film tab and pulling to the
right.
3. Clean the rollers if necessary.
NOTE
6. Insert the pack film into the film plane, pushing it to
the left and down until it snaps into place. Ensure
that the black paper leader is hanging over the right
end of the camera back and that the numbered white
tabs are not caught between the pack film and film
plane.
7. Close the film door, ensuring that the black paper
leader and numbered white tabs are outside the door.
Swing the door latch into place until it snaps into the
locked Position.
For the camera to operate properly, the Processing
rollers in the film back must be clean. Check these
rollers each time film is inserted. Instructions fo r
removal o f the rollers are displayed inside the film
door. I f the instructions are missing, refer to the
Maintenance section o f this manual.
8. Pull the black paper leader completely out. This will
expose the first white tab. The camera is now ready
fo r taking the first picture. The numeral on the white
tabs indicates the sequential number of the picture
that is ready fo r exposure.
4. Open the film box and carefully remove the foil-
wrapped pack film . Retain the instruction sheet and
print coater.
5. Remove the film from the fo il; be sure to handle the
NOTE
Only a white tab should be showing when a picture is
taken. I f a yellow tab is showing, p ull it completely
out and proceed to Step 3 o f the next paragraph,
film only by the edges. Advancing and Deveioping the Pack Film.
FIL M
DOOR
W HITE F IL M TABS
ARE UNDER BLACK
PAPER LEADER
BLACK PAPER
LEADER
FIL M
PACK
TAB
BLACK
PAPER
LEADER
(2 4 6 1 - 8 )2 8 2 5 -0 7
Figure 2-5. Installing the pack-film.
2-6

Operating Instructions—C-30B Camera
Advancing and Developing the Pack Film
A fter a picture is shot, advance and develop each ex-
posure as follows (see Figure 2-6):
1. Pull the white tab completely out of the back film . A
yellow tab with black arrows should appear.
NOTE
l f the yellow tab does not appear after the white tab
is pulled, take the camera to a darkened area, open
the film back, and carefully remove the yellow tab
that failed to pop out.
2. Smoothly pull the yellow tab completely out of the
film back using one continuous motion.
NOTE
Development time for Type 084 film is approxi-
mately 15 seconds at an ambient temperature o f
70° F or above. A slightly longer development time
generally provides greater p rin t contrast. Shorter
development time w ill decrease prin t contrast, but
may improve photographed details not otherwise
visible. Refer to a later Paragraph on Film Selection
and accompanying Table 2-2 fo r specification on
other films.
3. Wait fo r the proper development time. Follow the
directions contained in the pack film instruction
sheet for proper development times under various
conditions.
WARNING |
Many developing Solutions contain a caustic sub-
stance which may cause Chemical burns. I f you
accidentally get the solution on your skin, wipe it o ff
immediately and wash the area thoroughly as soon as
possible. Be extremely careful to keep the solution
away from the eyes and mouth.
4. When the development time is up, carefully peel the
print away from the negative. Do n o ta llo w th e print
to touch the damp negative after they have been
separated.
5. Prints that require coating should be coated as soon
as possible after separating them from the negative.
Use six to eight overlapping strokes to apply the print
coater along the entire length of the print, including
edges, borders, and corners.
2-7

Operating Instructions—C-30B Camera
USING THE POLAROID
ROLL-FILM BACK
Focusing
To focus the camera using the focus plate w ith a
Polaroid Roll-Film back, perform the following procedure:
1. Obtain a properly-adjusted trace on the crt.
2. Open the camera by swinging the latch lever out and
down from the top of the camera back as shown in
Figure 2-7.
3. Open the back fu lly and swing out the inner panel.
4. Orient the frosted side of the focus plate toward the
camera lens and insert the two bottom ears inside the
edge o f the camera-back film compartment. Gently
press the upper mounting ears all the way into the
film plane within the film compartment. The upper
mounting ears must be compressed, and the focus
plate inserted into the film compartment at the same
time as shown in Figure 2-8(A). The half-circle cutout
in the plate provides a finger hole fo r easy removal of
the focus plate.
Figure 2-7. Opening the roll-film back.
5. Set the aperture fo r maximum opening (f/1 .9) and set
the SPEED selector to T. With the shutter open, you
should observe a display on the biprism of the focus
plate.
NOTE
Either the crt horizontal trace or the internal
graticule line may be used to ad just focus.
6. Release the FOCUS LOCK knob and adjust the
FOCUS knob until the trace (or graticule line) is
aligned with itself. Refer to Figure 2-8(B) fo r an
example of an in-focus display.
7. Tighten the FOCUS LOCK knob to ensure that the
focus setting cannot be changed accidentally.
BIPRISM FOCUS HALF-C IRCLE
SPOT PLATE CUTOUT
A .FOCUS PLATE INSTA LLE D ON
RO LL FIL M CAM ERA BACK.
DISPLAY
IN-FOCUS
DISPLAY
B. CENTER OF SPLIT IMAGE
FOCUS PLATE
2 8 2 5 -1 8
Figure 2-8. Installing and using the focus plate in the roll-film back.
2-8 @

Operating Instructions—C-30B Camera
Installing the Roll Film
1. To load the roll film pack, open the camera back by
releasing the latch lever, and install the roll film by
following the detailed instructions contained in the
film box.
2. Close the back cover and hold it shut. Swing the latch
lever all the way towards the bottom of the camera
back to ensure that both sides of the back cover w ill
latch, then swing the latch lever to the locked
Position (towards the top of the camera back). There
should now be a short tab o f paper extending beyond
the cutter bar of the camera back.
3. Install the dark slide in the camera back to prevent
exposing the first frame.
4. Hold the camera back and lift the cutter bar by
raising up on the plastic edge. Once the cutter bar has
been lifted, it w ill remain in the up (unlocked)
Position until it is pushed down.
5. Pull the film leader out of the camera back until it
comes to a firm stop. About 15 inches of the film
leader must be pulled out before it will stop in the
proper Position for the first exposure.
6. Lock the cutter bar w ith a gentle downward pressure.
A fter it has latched, tear the film leader o ff and
discard it.
7. The camera back is ready for the first picture. Mount
the camera back on the camera main frame and make
proper shutter and lens opening settings.
8. Remove the dark slide before taking a picture. The
number of exposures remaining on the roll is
indicated on the film tab under the cutter bar.
Advancing and Developing the Roll Film
A fter a picture is shot, advance and develop each ex
posure as follows:
1. Throw the red release switch in either direction to
release the film . If you should throw it accidentally at
any other time, don't w orry—no harm is done.
2. Open the cutter bar by lifting the plastic edge and
take a firm grip on the film tab. With a single motion
pull the film tab straight out about seven inches. Pull
it about as hard and rapidly as you might pull down a
window shade; not hard enough to pull the shade o ff
the roll (or the film o ff the spool), but not slowly and
hesitantly. Remember, the film w ill stop auto-
matically.
NOTE
I f the film tab w ill n o t pull easily, throw the red re
lease switch again.
3. Press down and latch the cutter bar. Tear o ff and
discard the excess paper.
4. Wait the recommended development time. Follow the
directions in the instruction sheet for development
times under various conditions. It is important that
you check the instruction sheet for exact develop
ment time. This time varies for different types of
film , and even the development time for a particular
film may change.
5. When the development time is up, slide back the latch
on the print door and open the door. L ift the print
out carefully, starting with the cutout. Don't let the
print fall back on the damp negative.
WARNING
Many developing Solutions contain a caustic sub-
stance which may cause Chemical burns. i f you
accidentally get the solution on yourskin, wipe it o ff
immediately and wash the area thoroughly as soon as
possible. Be extremely carefui to keep the solution
away from the eyes and mouth.
6. Close and relatch the print door.
7. Apply the print coater along the entire length of the
print, including edges, borders, and corners. Use six
to eight firm , overlapping strokes. For the last two or
three pictures in each roll, press the coater down hard
against the top end of the p rint (not the image) for a
moment to release extra liquid; then spread the liquid
smoothly across the print.
@2-9

Operating Instructions—C-30B Camera
USING THE GRAFLOK BACK
Focusing
To focus the camera w ith a Graflok back, perform the
following procedure:
1. Obtain a properly-adjusted trace on the crt.
2. Set the aperture fo r maximum opening (f/1.9) and
set the SPEED selector to T.
3. Press the release button on the bottom-rear side of
the Graflok back to open the folding viewing hood as
shown in Figure 2-9. With the shutter open, observe
the image on the ground glass screen of the Graflok
back.
NOTE
Either the crt horizontal trace o r the internal
graticule line may be used to adjust focus.
4. Release the FOCUS LOCK knob and adjust the
FOCUS knob to produce a sharply-focused image of
the crt trace (or internal graticule line) on the ground
glass screen.
5. Tighten the FOCUS LOCK knob to ensure that the
focus setting cannot be changed accidentally.
Figure 2-9. View hood attached to the Graflok back.
Installing Loaded Film Holders
Sheet film is available in a variety of types. Some sheet
film requires prior loading into the film holder in a dark
room, while others permit daylight loading. For loading
conditions refer to the instructions contained with the
particular film being used.
The following procedure can be helpful in installing
most types of loaded film holders into the Graflok back.
Figure 2-10 shows how to install a 4- by 5-inch film holder
into a Graflok back.
1. Slide the top and bottom tab locks out to lift the
locking mechanism away from the focusing panel.
2. L ift the hinged focusing panel on the adapter and
insert the film holder into it.
3. Push the film holder into the Graflok back until it
locks into place.
4. Check that the adapter is flush against the holder on
all four sides.
5. Slide the top and bottom tab locks down to lock the
film holder.
6. To remove the film holder from the adapter, slide the
top and bottom tab locks up to unlock film holder.
L ift the hinged focusing panel away from the camera
slightly, grasp the film holder and lift it slightly, then
pull outward.
Figure 2-10. Installing the 4- by 5-inch cut film holder in the
Graflok back.
2-10