Evening star., 1950-05-28
Camera Angles
Producing Projection Slides

pod or it can be used in conjunc-
ton with specially made vertical
stand. For precision copying, a
ground glass is called for and If
the camera is not so equipped, a
sheet Of ground glass may be in
serted on the focal plane tempo
rarily while you obtain the critical
focus. However, the average anna
teur camera will not focus on
nearby objects and a supplemental
portrait attachment, which has
been described in previous articles,
will be required.
One manufacturer has a preci-
sion enlarger stand for use with
the camera and is equipped with
copying lights on movable goose
neck extensions. But if you have
couple of No. / foodlamps with
refectors, you will be well set in
this respect. The lights should be
placed at 45-degree angles to the
material to be copied on either
side of the camera. Slides, like
any other photographs, should be
correctly exposed and, as always.
we heartily recommend the use of
the exposure meter in calculating
exposures-particularly in the case
OF copying where the inexperi-
enced photographer can easily be
thrown off the track by light
bouncing back from white paper
or card surfaces. AS we have in
dicated above. sharpness in slides
is paramount consideration.
Since no motion is involved in
copy job, you should stop your
lens down sll the way and expose
accordingly.
How to Reduce Negatives.
You may well have, among your
larger negatives, a number that
you would like to reduce to slides
Of a smaller size. This can be
done by using an enlarger which
has been converted into a camera
with supplementary back which
holds the film or plate. The mega
tive is placed in a contact printer
and is photographed through the
enlarger-camer by means of the
transmitted light of the printer.
This is much better scheme than
trying to project the image down
to a very small size, because it is
an extremely delicate task to get
an accurate sharp focus by this
method.
There is still another method
for reducing large transparencies
to a smaller size. The camera is
mounted on cine -titler and the
large transparency is placed in
the title end of the device in front
OF a piece Of opal glass. Trans
mitted light from behind the opal
glass exposes the film in the
camera.
Many people are turning to
slides these days as a means for
keeping a record of the growth of
their children. Many more pic
lures can be retained than with
an album, as the small slides can
be filed away by the hundreds in
file boxes. Vacation shots that
used to fill drawers and closets are
now carefully preserved in the
same manner and collections of
slides covering many subjects are
appearing in the homes of anna
teurs.
Slide films are only a jump away
from motion pictures, and still
photographers who had never
given a thought to amateur movies
have been sold on the idea through
the use of slides. Color fans OBJ
tain special enjoyment from pro-
lection of their work because of
the high cost of having color
prints made. But with a slide
protector they can show off their
skill as color photographers with
out making their audiences squint
to view the tiny transparencies.
There is another side to slide
film production-darkroom pro-
cedure and finishing. We will go
into this phase in our next in
stallment.