In
case the minimum enlargement
with
the lenses delivered from the Reductions
factory is insufficient
(with
manual focusing), the reduction range
of
the
DURST
DA
900
can
be
increased
virtually
without
limit
by means
of
the special accessory extension tubes
DUTUB
and
DUTUB
II, so that
it
is unnecessary
to
give a
list
of
reduction factors.
Mounting the
DUTUB
extension tube
Remove the
lens together
with
its
lens board (12)
and
mount the
DUTUB
extension tube in
its
place into the enlarger head (5). Now the
lens can
be
mounted into the
DUTUB
and
focused by means
of
its
knurled outer ring.
The
focus is fixed
with
the knurled locking screw
upon the
DUTUB
extension tube. As the mark
on
the lens board (12)
or the diaphragm index mark
must
be
exactly at the front,
it
may
be
necessary
to
loosen the
DUTUB
lens retaining
screw
to
bring the lens
into
its
proper position (then do not
forget
to
tighten the screw
again!).
DUTUB
1\
lens extension tube
for
reductions and macrophotography
If
greater reductions are desired than possible
with
the DUTUB, then
use the
DUTUB
II extension tube, which is also suitable
for
macro-
photography.
It
is mounted into the enlarger head (5) in the same
manner
as
the
DUTUB
extension tube.
DUTUB
I
DUTUB
II
11
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