Omega C760 User manual

Modular
Dichroic and
Universal
Vari/Con™
Diffusion
Lamphouse
Systems
Instruction Manual

Important Safeguards
When
using
your
Omega
photographic
products,
basic
safety
precautions
should
always
be
taken,
including
the
following:
1. Read and understand all instructions provided
with this product.
2.
Close
supervision
is
necessary
when
this
product
is
used
by
or
near
children.
Do
not
leave
it
unattended
while
it
is
plugged
into
an
outlet.
3.
Avoid
touching
the
lamp
area
of
enlargers
or
other
hot
parts
as
it
may
cause
burns.
4.
Do
not
operate
this
product
if
the
power
supply
cord
has
been
damaged
or
if
the
product
has
been
dropped
or
damaged.
Have
it
checked
out
and
repaired,
if
necessary,
by
a
qualified
service
person
before
using.
5.
Route
the
power
supply
cord
away
from
hot
areas.
Do
not
let
the
cord
hang
over
a
counter
edge
or
across
an
open
area
where
people
pass.
6.
If
an
extension
cord
is
necessary,
use
one
with
a
suitable
rating.
Cords
rated
for
less
amperage
than
the
product
may
overheat.
Route
the
exten-
sion cord away from open areas where it may be
tripped over or pulled.
7. Always unplug the product after use. Grasp the
plug and firmly pull from the outlet to discon-
nect. Never yank the cord from the outlet.
8. Allow the product to cool to room temperature
before storing. Wrap the power cord loosely
around the product.
9.
Do
not
immerse
this
product
in
water
or
other
liquids.
10.
To
reduce
the
risk
of
electric
shocks,
do
not
at-
tempt
to
disassemble
or
repair
this
product.
Always
have
it
serviced
by
qualified
service
per-
sonnel
when
necessary.
Incorrect
reassembly
can
cause
electric
shock
hazards.
These
safeguards
are
prescribed
by
Underwriters
Laboratories
to
be
included
in
this
instruction
manual
for
U.L.
listed
SAVE
THESE
INSTRUCTIONS
products.
Contents
1.
Technical
Specifications
............-.++eeeee-
2
De
IAtKOGUCEOMusicicisrsiscete
ouster
A
crater
otoheleca
seis
s
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>
3
3.
Unpacking
Your
C760
Dichroic
Lamphouse
.......
4
4.
Assembly
and
Installation
.............-+2++0+s
6
a. Using the C760 Lamphouse with the
C760 Enlarger
b. Using the C760 Lamphouse with C700,
B600 and Concept Six Enlargers
c. Using the C760 Lamphouse with B66
and B22 Enlargers
d. Using the C760 Lamphouse with
C67 Enlargers
5.
Electrical
Connections
...........-.+seseeeees
11
a. Timers
b. Voltage Stabilizer
Interchangeable
Mixing
Chambers
............--
12
Using
the
Light
Attenuators
.........-...-..-+-
12
White
EightiGontrol
ccc.
oe
ee
crkerstaie
ws
a
ialeters
12
GolorBrin
liner
nts
=
oo
ars...
2e
cic
ceric
eters
nin
etere
rs
13
. Setting Filtration
. Making Your First Color Print
. Using a Color Analyzer
. Exposure Compensation
. Light Attenuator
Filtration and Exposure Time
. Exposure Time with the CS-50
Auto Exposure Controller
Cio
Q>ona00M
10.
Black
and
White
Printing
.........---+e
eens
14
a.
Printing
by
Diffused
Light
b.
Using
Variable
Contrast
Papers
c.
Your
First
Black
and
White
Print
11.
Copy
Camera
Attachment
and
Slide
Copying
....16
12.
Lamp
Replacement
........------
ses
ee
eeeeeee
16
13.
Glossary
of
Color
Printing
Terms
..........++..
17
14.
Recommended
Reading
......-..-.+e
sere
renee
18
Technical
Specifications
Dichroic Lamphouse
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ote
120VAC,
60
Hz.
ieee
coc
85W/82V,
Pre-focused
Quartz-Halogen
(Cat.
No.
471-400)
Dichroic
Filtration
Range.
.
.
.0-200CC,
C,M,Y,
Fade-free
Diffusion Lamphouse
POWER
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e
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we
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120VAC,
60
Hz.
Eamp
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85W/82V,
Pre-focused
Quartz
Halogen
(Cat.
No.
471-400)

introduction
Your Super Chromega C760 Dichroic or C760 Universal Vari/Con™ Diffusion Lamphouses provide features and advan-
tages which make it superior to any similar unit now available. To help you take maximum advantage of these
features, they are described briefly in this section. The numbers in parenthesis refer to pages in this Instruction
Manual on which these features and their applications are discussed in detail.
Thank you for selecting the Omega C760 Lamphouse.
Your C760 Lamphouse provides an extremely
versatile, high-output illumination system for your
Omega medium-format enlarger. Its many advanced
features give you the ability to produce finer prints in
color and in black-and-white quickly, consistently and
easily. You can even use your C760 Dichroic
Lamphouse as a light box for duplicating color slides.
Like every Omega product your C760 Lamphouse is
built to traditional Omega standards of quality and
performance. This means the finest materials,
meticulous workmanship and a design that is “human
engineered” for efficient, comfortable operation. Your
C760 Lamphouse should give you many years of
trouble-free service.
In order to get the best results from your C760
Lamphouse, read through this Instruction Manual
before using the lamphouse or installing it on your
enlarger.
If you have any questions or problems with this, or
with any Omega equipment, write to us for
assistance. And, if you have any comments or
suggestions, let us hear from you. You can write to
Customer Service.
In U.S.A.:
Berkey Marketing Companies
P.O. Box 1102
Woodside, NY 11377
or
Berkey Marketing Companies
3400 East 70th Street
Long Beach, CA 90805
In Canada:
Berkey Photo (Canada) Ltd.
70 Floral Parkway
Toronto, Canada M6L2C1
In Denmark:
Berkey Technical A/S Denmark
160 Vangedevej
2860 Soeborg
Copenhagen, Denmark
(Copenhagen) 69 61 11
Finally, because Omega is dedicated to a policy of
continuous product improvement and review,
specifications may change without notice.
Good luck and good printing.
FEATURES OF THE OMEGA C760 DICHROIC AND
DIFFUSION LAMPHOUSES
Versatile
In keeping with Omega’s traditional policy of non-
obsolescence, your C760 Lamphouse can be used on
a wide range of medium-format Omega enlargers,
both current and eariler models. Your C760
Lamphouse can be used with C760, C700, B600,
Concept Six, B66, B22 or C67 enlarger. The only
requirement is suitable mounting hardware. This
means that even if you change enlarger chassis later
on, you can still use your C760 Lamphouse simply by
getting the appropriate hardware (Page 5).
Expanded Filtration Range (Dichroic Lamphouse Only)
The filtration range of the C760 Dichroic Lamphouse
is from 0 to 200CC, using special, non-fading dichroic
glass filters which produce remarkably “pure” colors
in cyan, magenta and yellow. Extremely accurate
color settings are obtained permitting consistent and
precisely repeatable color filtration. (Page 13)
Even Illumination
By using a specially designed, pre-focused 85-watt
Quartz Halogen Lamp with integral reflector and a
scientifically designed mixing chamber with
interchangeable tapered diffusers, your C760
Lamphouse provides exceptionally even illumination
on your baseboard. This means that print densities at
the center of the image and at the corners will be
almost the same. (Page 12)
High Light Output
The efficient design of your C760 Lamphouse means
higher light output for shorter, more convenient
printing times even at extreme magnifications. This
high light output also permits exposures in the
optimum ranges of times, from 5 to 40 seconds, to
minimize the dangers of color shift resulting from
unusually long exposures. The high light output in
conjunction with our reversible girder makes possible
floor projection for mural size prints.
White Light Control (Dichroic Lamphouse Only)
A special white light lever quickly removes the
dichroic filters from the light path without disturbing
the filter settings. This permits accurate focusing and
baseboard composition by white light. An illuminated
jewel indicates that dichroic filters are removed from
the light path. (Page 12)

Special Light Attenuators
To provide more complete control over light output,
interchangeable light attenuators are supplied and
can be used to reduce the light by one, two or three
fistops. This permits using optimum aperture/
exposure time combinations for convenient exposure
or use of creative controls such as dodging and
burning-in. (Page 12)
Attenuators supplied with dichroic lamphouse and
available as an optional accessory (Cat. No. 429-330)
for diffusion lamphouse.
Diffused
Illumination
for
Black-and-White
Printing
Many
of
today’s
outstanding
photographers
prefer
to
use
diffused
light
for
black-and-white
enlargements
rather
than
the
conventional
condenser
illumination.
One
reason
is
that
diffused
light
tends
to
produce
a
full
range
of
subtle
tones
with
great
accuracy.
In
addition,
diffused
light
serves
to
minimize
graininess
and
“supress”
minor
imperfections,
dust
and
scratches
on
the
negative,
greatly
reducing
the
need
for
retouching.
(Page
14)
Built-In Infra-Red and Ultra-Violet Filtration
Both
IR
and
UV
emissions
can
affect
the
color
of
your
final
print
even
though
these
rays
are
invisible.
Your
C760
Lamphouse
filters
out
these
emissions
so
that
the
desired
filtered
light
reaches
the
paper,
resulting
in
more
accurate
control
of
final
print
color.
Built-In Solid State Power Supply
Eliminates the need for external transformer or power
supply. You can simply connect your C760 Lamp-
house to an Omega enlarging timer or to any con-
venient standard 110V 60Hz AC outlet, or 240V 50Hz
outlet depending on unit purchased.*
*Recommended Optional Accessory: For the most
precise, consistent color printing regardless of power
fluctuations, the use of the solid state Voltage
Stabilizer (Cat. No. 403-730) is strongly recommended
for the 110V 60Hz only. The 240V 50Hz units have the
stabilizer built into the lamphouse.
Flow-Through Convection Cooling System
A combination of cooling fins and light-traps provides
convection cooling for greater comfort and for
reduction of heat on the negative, thus helping prevent
negative buckling.
Convertible for Slide Duplication
(Dichroic Lamphouse Only)
By simply inverting your C760 Dichroic Lamphouse on
the baseboard, you have an ideal lightbox with
complete color control for duplicating color sides. You
can use the full range of CC settings for color
correction or to create unusual effects. (Page 16)
Unpacking Your Lamphouse
1. Open the shipping container carefully and gently
remove the contents. Check all items against the
enclosed check list and do not discard any
packing materials until you have accounted for
all components and mounting hardware. Save
the cartons for possible future use: they are
designed to give your equipment maximum
protection during storage and shipment.
2. As noted eariler, your C760 Lamphouse can be
used with all current and recent medium-format
Omega enlargers. The only difference is in the
brackets that are used to attach the lamphouse
to the enlarger chassis. Mounting hardware and
brackets are included for C760, C700, B600 and
Concept Six enlargers. If you are adding a C760
Lamphouse to your present C67, B66 or B22
enlarger, use the appropriate Mounting Kit
described on page 5.
3. If any parts are missing, contact your local
dealer or: Consumer Service at the address
closest to you listed on page 3.

Omega Super Chromega
C760 Dichroic and
C760 Universal Vari/Con™
Diffusion Lamphouses
1. Filtration Control Knobs and Magnified Scales
for Cyan, Magenta and Yellow Filtration
2. Lamphouse Access Cover with Cover Nut
3. Slot for Light Attenuator
4. Light Attenuator (Three are supplied with the
C760 Dichroic Lamphouse Only. Available as op-
tional accessory for diffusion lamphouse. Order
Cat. No. 429-330)
5. Interchangeable Mixing Chambers
6. Interchangeable Tapered Diffusers
. Diffuser Holders
. White Light Lever and Illuminated Jewel In-
dicator Light
. Quartz Halogen Lamp
. Mounting Bracket for C700, B600 and Concept
Six Enlargers
. Glides and Mounting Screws for C760 Enlarger
. Hexagonal Nut
. Wrench
. Adapter for C67 Enlarger. Not supplied with Lamp-
house. Order Cat. No. 429-368
. Adapter Kit for B66 and B22 Enlargers. Not sup-
plied with Lamphouse. Order Cat. No. 429-366
Vari/Con Module. Order Cat. No. 429-376

Assembly and Installation
USING YOUR C760 LAMPHOUSE ON OMEGA C760 ENLARGERS
Note:
The
following
operation
can
be
performed
most
conveniently
by
lowering
the
carriage
to
the
bottom
of
the
girder.
At the rear of the lamphouse are three holes, two on
one
side
and
one
on
the
other
side.
These
holes
are
for
attaching the black grooved glides. There are three
Phillips
head
screws
used
to
attach
the
glides
to
the
lamphouse, using a Phillips screwdriver. Place the
screws into the glides with the grooved end closest to
the
head
of
the
screw.
Screw
each
glide
into
place
in
the rear of the lamphouse. Tighten the screws to make
sure
the
glides
are
securely
fastened
to
the
lamphouse.
Mount
the
four
locking
screws
supplied
with
the
C760
Chassis
onto
the
lamphouse
mounting
plate
from
the
rear,
making
sure
not
to
extend
them
beyond
the
mounting
plate.
Place the lamphouse on the Film and Lens Stage
Module
so
that
the
glides
fit
into
the
corresponding
key-shaped
openings
on
the
mounting
plate.
When
the
lamphouse
is
in
position,
tighten
the
locking
screws
until
they
make
contact
with
the
rear
of
the
lamp-
house.
Note:
Refer
to
alignment
section
of
your
C760
Enlarger
Instruction
Manual
for
use
of
these
locking
screws for optical alignment.
USING
YOUR
C760
LAMPHOUSE
ON
OMEGA
C700,
B600,
AND
CONCEPT
SIX
ENLARGERS
Note:
The
following
operations
can
be
performed
most
conveniently
if
you
set
your
enlarger
on
the
floor
orona
low
table
so
that
the
top
of
the
girder
is
just
about
at
chest
level.
When
the
enlarger
carriage
is
at
a
convenient
height,
tighten
the
carriage
lock
knob
to
lock
the
carriage
in
position.
(If
you
purchased
your
C760
Lamphouse
as
original
equipment
with
enlarger,
start
at
Step
“4”
instead
of
Step
‘‘1’’.)
1. Before starting, make sure that all power cords
are unplugged from timers, voltage stabilizers or
electric outlets.
2. To replace an existing condenser lamphouse,
unscrew the four slotted screws which attach
the lamphouse to the carriage and lifting lever.
Carefully remove and store the lamphouse and
all of its parts for possible future use. KEEP THE
FOUR SLOTTED SCREWS as they will be needed
to attach the C760 Dichroic Lamphouse.
3. To replace an older Dichroic Lamphouse,
carefully remove the Phillips head screws and
lamphouse retainers as they will be used again.
When ready to mount the C760 Dichroic
Lamphouse, the chassis should look as
illustrated to the right.

4. Take the C700 mounting bracket and attach it to
the rear of the C760 Lamphouse as shown in the
illustration below, using the hexagonal nut and
wrench. Tighten enough to keep the bracket firm.
H
4
. Position the C760 Dichroic Lamphouse (with the
mounting bracket attached) on the film stage of
the enlarger. Make sure the mounting bracket fits
inside the bracket on the enlarger carriage. Line
up the four screw holes and reinsert the slotted
mounting screws.
When correctly installed, the enlarger with the
C760 Dichroic Lamphouse should look like the il-
lustration below.
. In order to provide even illumination over the en-
tire negative area, and to minimize light leakage
around the negative stage, you must align the
lamphouse.
7. To align the lamphouse, attach the lamphouse
to a power source — either a timer, a voltage
stabilizer or directly into the AC line. Pull the
lamphouse lifting lever of the enlarger forward to
raise the lamphouse and insert a film carrier of
the largest size negative you will be using into
the enlarger. Lower the lamphouse lifting lever
so that the lamphouse rests on the film stage.
8. Loosen the hexagonal nut on the mounting
bracket slightly and adjust the C760 Lamphouse
so that the light seals at the bottom make
contact with the film carrier. The edges of the
film carrier should be square within the light
seal as shown in illustration below.
9. When the lamphouse is correctly aligned, you
should not be able to see any significant light
leakage between the lamphouse and the film
carrier. At this point, tighten the hexagonal nut
to secure the lamphouse. Switch off the power.
Your C760 Lamphouse is ready for use.

USING YOUR C760 LAMPHOUSE WITH OMEGA B66 OR OMEGA B22 ENLARGERS
Note: The following operations can be performed most conveniently if you set your enlarger on the floor or ona
low table so that the top of the girder is about chest level. When the enlarger carriage is at a convenient height,
tighten the carriage locking knob to lock the carriage in position.
1. Disconnect all power cords before starting.
2. Remove the existing condenser lamphouse from
your enlarger chassis following the instructions
given in the instruction manual for your par- :
ticular model. Be careful with condenser lenses H
and enlarging bulbs to avoid damage or breaking.
Store all parts carefully for possible future use.
Press
the
C760
Lamphouse
into
position
so
that
,
the
mounting
arms
clear
the
Phillips
head
3.
Attach
the
B66/B22
mounting
bracket
to
the
rear
Screws.
hed
the
lamphouse
is
eanectiy
posi-
of
the
C760
Lamphouse
as
shown,
using
the
tioned,
the
screws
should
be
within
the
oval
hexagonal
nut
and
wrench.
Tighten
enough
to
cutouts
of
the
mounting
arm,
as
shown.
keep the bracket from moving.
i
BS
4. Position the C760 Lamphouse with the mounting
bracket attached in the approximately correct
position on the film stage of the enlarger. Then,
spread the mounting arms slightly so that they
slide over the Phillips head screws at the top of
the carriage side plates. You will have to exert
some force to spread the arms sufficiently to
clear the heads of the screws.

5. Install the right side mounting hardware (right 7. Repeat the operation described in Step ‘5” on
side when you are facing the enlarger) which the LEFT side of the lamphouse.
consists of a knurled screw and a black plastic
tab mounting bushing. Secure the hardware but 8. To align the lamphouse, place a film carrier for
DO NOT TIGHTEN. the largest size negative you will be using on the
film stage of the enlarger. Proper alignment en-
sures even illumination.
6. Position the enlarger lifting arm lever on the left
side and use the slotted screw, star washer, and
flat washer in combination to make up the lifting
arm adjustment assembly. The star washer
should go next to the arm, followed by the flat
washer and then by the slotted screw.
Install the screws in the tapped hole at the front
end of the lamphouse mounting arm. Secure but
DO NOT TIGHTEN. Then move the lifting arm so
that the lifting lever screw is approximately in
the center of the oval cutout on the arm. Now
tighten this screw. This adjustment controls the
amount of lamphouse lift and can be changed
later if desired. 9. Attach the lamphouse power cord to an Omega
timer or directly into the a standard AC outlet. If
the C760 Lamphouse is attached to a timer, turn
on the switch. If the lamphouse is connected
directly to an AC outlet, it will go on
automatically.
10. Position your C760 Lamphouse so that the light
seal at the bottom comes in contact with the
film carrier squarely. Once the lamphouse is in
its correct position, simply tighten the hexagonal
nut and all of the positioning screws on the lifting
lever arm. Turn off the power.
11. Finally, you might want to check the alignment
of your enlarger’s film carrier stage, lens stage
and baseboard. All of these stages should be
completely parallel. For precise determination of
alignment, Omega provides a special Enlarger
Alignment Too! (Cat. No. 479-027) which is
both simple to use and precise. For more infor-
mation, contact your local dealer or Consumer
Service, Omega, Woodside, New York 11377.

USING YOUR C760 LAMPHOUSE ON
OMEGA C67 ENLARGERS
1. Disconnect all power cords.
2. Depress the enlarger lamphouse lifting lever
until it locks into place, thus raising the
lamphouse.
3. Remove the power cord from the clip at the rear
of the enlarger carriage. Slide off the condenser
lamphouse by lifting the entire unit until it clears
the slots at the front of the enlarger carriage.
Store the condenser lamphouse and all parts
carefully for possible future use.
4. Attach the C67 mounting bracket to the rear of
the lamphouse making sure that the bottom edge
of the bracket contacts the bottom lip of the lamp
house. Tighten securely using the hexagonal nut.
10
5. Holding the C760 Dichroic Lamphouse by the
side plates, slide the grooved square guides into
the slots at the front of the carriage, gently
pushing the lamphouse down until it comes to a
complete stop.
Raise the lamphouse lifting lever to lower the
C760 Lamphouse so that it now rests on the
negative stage. Slip the power cord from the
lamphouse under the clip at the rear of the
enlarger carriage.
. Your C760 Lamphouse should now be in position
for alignment. Take a film carrier of the largest size
negative you will be using and slide it into the
negative stage.
. Connect the power cord of the C760 Lamphouse
to an Omega Timer or directly into a standard
AC outlet. If you are plugged into a timer, turn
on the timer switch. If you are plugged into an
outlet directly, the lamphouse will automatically
go on.
. In order to ensure even illumination you must
align the lamphouse.
Position the lamphouse so that the light seals at
the bottom are squarely in contact with the film
carrier. When your C760 Lamphouse is correctly
positioned, you should not be able to see any
significant light leakage between the lamphouse
and the film carrier.
Once the lamphouse is properly aligned, tighten
the nut holding the mounting bracket (using the
open-end wrench supplied for that purpose) to
maintain the lamphouse in the correct position.