UPA-510, a portable photographic enlarger focused manually and
automatically, is a means for the projection enlargement on the screen of
negative formats of 24x36 and 18x~4mm available on the 35-mm movie film,
and of negative formats of 10 to l4mm on the 16mm movie film.
enlargement in colour, use is made of correction light filters measuring
60x60mm. An autofocus device operates in a magnification range from 2.5x
to 8x. Manual focusing covers a magnification range from 8X to 20X. A
sharp image is not disturbed in transferring from the manual to the
automatic mode of focusing and vice versa. DESIGN The enlarger
substitutes the emulsion of a negative film frame for the screen, thus
giving positive prints. The basic members of the enlarger (Fig. 1) are
screen l, autofocus device 8, condenser 3, negative frame 2, and
illuminator 4. The packing case serves as the screen. The packing case
mounts a post holder in which lower post 10 is fixed by screw 1. The
lower post screws into upper post 7 that carries autofocus device 8.
the upper post, the autofocus device consists of a bracket and projector.
All these components interact through the agency of a lever-type
mechanism that connects the post together with a built-in cam to a
carriage with a tube. Moving the bracket along the post by means of
rack-and-pinion mechanism 9 results in a precisely computed displacement
of the tube carrying the objective so that the image stays in focus
automatically as the enlarger is racked through the magnification range.
Never disassemble the autofocus device (the upper post,) bracket and
projector 1. The tube rigidly attached to a rod is in a movable coupling
with the carriage whose roller rotatably slides over the slit in the rod;
thus, rotating the roller by means of the rack-and-pinion mechanism
displaces the tube with the objective with respect to the carriage, which
provides manual focusing.
enlarger comes with the Industar 50-Y-1 objective of a 53.4-mm focal
length. Condenser 3 consists of a body, a lid and a tray. The body and
lid mount condenser lenses. The tray positioned in the space between the
lenses houses correction light filters (four as a maximum) used for
enlargement in colour.
couples the body to the lid, thus giving an easy access to the condenser
interior in the case of lens contamination. Detachable negative frame 2
provides for free insertion and movement of the film which is flattened
by a glass plate and guides entering into the film perforations. To allow
for film movement, apply the depressing force downward onto the negative
film rest. On removal of the force, the film is clipped in place.
negative frame has two detachable framing inserts whose frame windows
measure 18x24 and 10x14mm, respectively. Illuminator 4 consists of a
cover mounting a lamp holder, and upper and lower enclosures which are
connected by a rotatable latch where, the clamps of the upper enclosure
enter the slots on the lower one.
illuminator uses an incandescent lamp, krypton, matted or coiled-coil,
rated for 127/220 V and 60 V as a maximum. The lamp with its holder is
fixed to rod 5 which helps adjust evenly the illumination of the screen
by axial and radial displacements of the rod in a joint. The packing case
has a shock-absorbing foam plastic material cemented to its interior,
thus providing good storage and transportation conditions.
operating the enlarger, take it out of the packing case and assemble its
members as follows:
the packing case and lock the latches:
2. Screw the lower, post into the upper one as far as it will go.
3. Insert the autofocus device into a port on the case cover, lower the
device until it sits in place in the post holder and install screw 11. If
a picture frame is used, raise the lower post in the post holder and fix
it with screw 11 by setting the screw in this case in the lower groove of
the post. Be sure that the height of the picture frame does not exceed 22
mm. For frames smaller in height, use adjustment spacers.
4. Place lower enclosure 1 (Fig. 2) of the illuminator onto she condenser
assembly and install the attachment screw.
5. Mount lid 2 with the mains connecting cord and the lamp on to upper
enclosure 3 and join the enclosures.
6. Set negative frame 4 into the slot in the projector body. When a
narrow width film is handled, the desirable framing insert is inserted in
the frame window of the negative frame. Evenly adjust the screen
illumination by proper displacements of the rod carrying the lamp holder.
If matted (pearl)
lamps are not available, place a ground glass in the light filter tray.
Always use an incandescent lamp rated for 60 V as a maximum.
lamp energised, obtain the required magnification by moving the bracket
over the post with the help of the rack-and-pinion mechanism; operate the
clamping screw to fix the obtained condition. Up to a 8X magnification,
the image is projected on to the enlarger screen using the autofocus
device. For larger magnifications, turn the enlarger post through 180°
and proceed to project the image on a screen configuration, say, floor or
stool below the enlarger screen.