STEREOSCOPIC CAMERAS 25able lensboard, too often results in unequal displacement of the
two lenses, and the essential identity of base is destroyed. (Gen-
erally obsolete).
REFLEX CAMERAS.-The reflecting principle has been popular
because the body is rigid, and the lens extension so short and so
sturdily built that there is far less danger of lens displacement
than in the folding types. One of the best of this type of camera,
although it does not belong to the small camera group, was the
Stereo Graflex using a 5x7 plate upon which the two stereo units
were recorded in size suitable for direct printing in the American
3x6 inch paper print.
THREE-LENS CAMERA.-The$ cameras are often said to follow
the Rolleiflex model, but that is reverse order. The Heidoscope
was originally built as a rigid, all metal, three-lens camera, the
center lens being the finder lens co-acting with a reflecting mirror
set in the center of the top of the camera. This camera proved so
successful that the manufacturers later brought out a twin-lens
monocular-type camera which they named the Rolleiflex.
The same design was adopted for the Voigtlander Stereofleck-
toscope. Both the Heidoscope and the Stereoflecktoscope were
made in both the normal sizes.
ROLLEIDOSCOPE CAMERA.-In this country we may regard the
plate cameras as obsolete, but the rollfilm version of the Heido-
scope, known as the Rolleidoscope is strictly modern and has all
of the quality and attractiveness of the plate model Heidoscope.
If you are in the market for a 6x13 camera, you will do well to
give the Rolleidoscope very careful consideration. There is no
better camera made in this size.
The construction is conventional. Just imagine two Rolleiflex
cameras built side by side, with only one finder lens and th.it
situated midway between the two taking lenses instead of above.
The reflex focusing-and-finding system is the same as in the
Rolleiflex.
The camera makes five stereo pairs upon a standard roll of
120 film, the negatives corresponding to the 6x13 stereo size.
The shutter is a Stereo-Compur of the usual set type. Focusing
and speed are controlled by knobs at the two ends of the lens-
board, and a moderate amount of rising front is provided. The
lenses are f4.5 Tessars, 75mm focal length.