Photomicrographs
The single-lens reflex camera EXAKTA Varex opens also
- similarly to close-ups - the large field of
Photomicrography, by simple and inexpensive accessories.
The reflex screen image serves for focusing and observing
the microscopic picture. You observe it until you press
the shutter release button.
The two Microscope Attachments connect the EXAKTA
Varex to any microscope. The camera can be adapted with
one of the two attachments to the ocular tube of the
microscope which has the standard outside diameter of
about 25 mm. Microphotographs are taken with the optical
system of the microscope and not with the camera
lens.
Microscope
Attachment Type 1
The camera is fixed to the top part of the attachment:
The bayonet ring is put into the camera-bayonet in the
same way as a lens. To attach the combination of camera
and attachment to the microscope, remove first the ocular
from the microscope tube. Camera and attachment tilted up
are put on the tube, the ocular is replaced and, by a
slight turn of the clamping screw, the microscope
attachment is fastened to the microscope tube. Then the
camera is tilted up and the microscope attachment bolted
up. By means of the hinged clamp the camera can always be
tilted to the side, when photographic work is being
suspended for exchanging oculars or when subject
observation should continue.
Microscope
Attachment Type 2
Top and bottom parts of this attachment can be
separated by loosening the quick-change mount: The
indented screw is slightly screwed out and the top part
of the microscope attachment lifted out of the mount. The
top part is attachable by its bayonet ring to the camera
as usual. Then, after removing the ocular of the
microscope, push the bottom part on the notch-ring by
turning it to the left, whereby the grip-border must be
held fast. The top part of the micro attachment with the
camera is put into the quick-change-mount: First place
the cone under the two latches, then the opposite side
slides into position. Tight the set screw, and make the
top part in the mount safe to operate.
The top part cone of type 2 of our microscope
attachment is also adaptable to all microscopes with
tubes of 25 mm. diameter. On these microscopes the tube
is removable and the EXAKTA Varex together with the top
part of the micro attachment is placed into the switch
mount of the tube support of the microscope. It is
possible to take so-called "Lupen" Pictures - Macro
photographs - with the microscope objective alone. The
Microtars are especially qualified for this purpose. We
regret that it is impossible to give here technical
instructions for taking photomicrographs. This field is
so large that it will be of no use picking out a few
points only. We rather recommend to consult one of the
many books about this subject.
Special
focusing glasses
The possibility of instantaneously interchanging the
focusing glasses of the EXAKTA Varex is of great
advantage for taking micro- and "Lupen" (macro) pictures.
You can use, instead of the regular ground glass, the
special glasses described below. Although it is desirable
to compose the image on a ground glass, the sharpness
must be determined through the clear centre spot by
focusing into the air. In taking "Lupen" photos a fully
clear glass proves to be indispensable. The ground glass
of the reflex finder hood is on the under part of the
large magnifying glass, which may be removed from the
framework by loosening two holding screws and replaced by
the desired type of glass. It is, however, recommended to
purchase an additional complete reflex finder hood with
the desired glass for the sake of greater convenience,
particularly as the price is not high. With the Penta
Prism, however, the ground glass can be changed and
consequently special glasses alone are available for
it.
The following special glasses are offered:
- Reflex Finder hood with ground glass and
clear center spot of 3 or 10 mm. (both with hairline
cross in the clear spot)
- Reflex Finder hood with focusing glass completely
clear and hairline cross.
- Ground glasses for Penta Prism with clear center
spot of 3 or 10 mm. (both with hairline cross in the
clear center spot)
- completely clear glasses with hairline cross.
The focusing systems with clear center spot or clear
overall are also practical for endoscopic pictures in
medical photography. The hairline cross avoid, at all
times, the unwanted continuation accommodation by the
eye. In Photomicrography correct focusing is attained
when both hairline cross and image appear to be
simultaneously sharp. When moving the eye over the clear
spot to and fro, hairline cross and image must not shift
each against the other, if correctly focused. The same
should happen when taking "Lupen" pictures. Other special
types of focusing glasses could be supplied according to
specifications (e.g. with etched cross lines, cm. or mm.
graduations, etc.)
Lens
Magnifier
The supplementary magnifying lens in the Finder hood
of the Exakta Varex does not always meet the great
optical requirements of critical focusing in close-up and
micro-work. Therefore, the "Lens Magnifier" was designed
for the specialised fields of Macrophotography and
Photomicrography. It can be inserted into the Exakta
Varex instead of the Finder hood or Penta Prism, and
makes possible to focus and examine the reflected image
with one of the highly corrected EXAKTA Varex normal and
special lenses. The lens is set in the bayonet mounts of
the Lens Magnifier. Focused at infinity, it shows a
magnified and evenly sharp reflected image without
distortion or aberration.
All normal and special ground or clear focusing
glasses may be used in the Lens Magnifier. With a
partially or completely clear screen, the image is easily
and quickly discernable. The normal or long-focus lenses
when used as critical magnifiers permit to examine the
whole area of the reflected image, whereas with a 40 mm.
picture taking lens the range of vision is somewhat
limited so that you will see the center part of the image
only.
The Lens Magnifier is all the more practical as the
normal lens of the EXAKTA Varex is not used for taking
Photomicrographs, thus being free for serving as
magnifier. Additional magnifications can be obtained,
when holding a small pocket telescope as supplementary
focusing help over the Lens Magnifier (e.g. the Tellup
giving a 2.5 times magnification).
The total magnification results from multiplying the
lens magnification with that of the pocket telescope. The
modern lenses the mounts of which offer the comforts of
the pre-set diaphragm and the automatic diaphragm
presetting device and additionally operate as a natural
light trap, too, have, however, when used as a magnifier,
a distance somewhat too large between front lens and eye,
so that you can no more see the full ground-glass image.
For the Lens Magnifier, therefore, an additional
magnifying glass was made, effecting a magnification of
about 4.5 times (thus total magnification with the
magnifying ground glass about 5 times). So you can very
well control and accurately focus the total ground glass
image owing to the good optical performance of the
additional magnifier.
This magnifying glass is mounted in the same way as a
lens of the EXAKTA Varex and inserted so, too, in the
bayonet of the lens magnifier.
Important
Note
Close-up and micro exposures with the EXAKTA Varex are
not only obtainable with the accessories described in
this booklet. For achieving utmost economy in this field,
as well as in other spheres of photography, the
"Vielzweck"-Multi-Combination for the EXAKTA Varex has
been designed. Please ask for information, also regarding
this equipment, the versatility of which you will find
most welcome. We shall be glad to send you a detailed
brochure. Here just a short reference to the individual
groups of the "Vielzweck": For close-up and magnifier
work there is the Bellows Attachment (Fig. 9).
Reproductions are conveniently carried out with the help
of the Copying Stand, which, by the way, also serves as a
sturdy table tripod for other purposes. The Bellows
Attachment and Copying Stand combined are used for
photomicrography. Duplicates of small transparencies, on
an optical basis, are made with the Transparency Copy
Equipment. For medical photography, especially for
photographing cavities of the body, the "Kolpofot" has
been especially constructed. It works in connection with
an electronic flash unit.
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