Illumination
4
7
1.
Light sources
As a rule,
the
most
brilliant,
brightest
and
best
illumination
for
most
negatives is obtained by
the
combination
of
an
opal lamp and a
twin
condenser.
Normally
opal lamps
of
up
to
150
W. are used, although also
a
250
W. opal lamp may be used.
To
avoid intense heat,
the
AUTOCALO
heat absorbing
filter
can be ordered separately and installed.
It
consists
of
2 pieces in a positioning frame. AUTOCALO is inserted over
the
hereto provided gUide
tracks
(30)
into
the
mirror
housing and fixed
with
both
the
screws
(19).
Every opal lamp should be checked before use (glass
defects
or
dark
spots in
the
bulb may be seen by holding
the
lamp up against a
strong
light).
During
frequent
current
fluctuations and
after
long use,
combustion
depOSits are formed
which
lead
to
uneven illumination.
For
this
reason
the
lamps should
be
checked
from
time
to
time.
After
more than
50
hours
of
use the opal lamps are
no
longer suitable
for
colour work.
The cable (17)
with
plug and
switch
pending
from
the
enlarger head
(5) is
for
connection
to
the
mains.
After
removing the cover
of
the
To Next Page
Loading...