24 THREE-DIMENSIONAL PHOTOGRAPHYThe final test of any camera is the pictures which it will pro-
duce. This camera, under test, performed in a satisfactory manner
and provided sharp, clear pictures, while the high speed has
proved most convenient at times.
These five cameras have been described in detail because they
represent typical American, French and German design. Other
domestic 35mm cameras are on the way, but with the possible ex-
ception of a reflex model, it is doubtful if anything radical will be
presented.
CONVENTIONAL SMALL CAMERAS.-There have been literally
hundreds of models of stereoscopic cameras offered from time
to time, starting with the old Daguerrotype cameras and paral-
leling monocular design since that era. It would be useless to
try to describe all of them, so we shall limit our discussion to
relatively modern designs; to designs of some degree of origi-
nality; and to designs which are still available either new or used.
We are informed that the well-known Rolleiflex cameras, the
Heidoscope and Rolleidoscope are now available for those who
prefer to work in the larger 6x13 size. The Rolleidoscope uses 120
roll film.
FOLDING CAMERAS.-Many of the well-known makes of folding
roll-film cameras were made at one time or another in the stereo
type. There was once a Stereo Kodak made in this country, also
the Stereo Hawkeye; while among the imported cameras, Ihagee
and the Ica Ideal were both made in stereo models. These cam-
eras were typical of the cameras most familiar to us as amateur
film and filmpack models.
The press type of camera was also made in stereo. This camera
is typically a thin, flat instrument when folded and extends, not
by means of a hinged door, but by pulling the lensboard straight
out upon lazy-tongs supports. In this group the better known
stereo cameras included Ernemann, Zeiss (one model), Makina,
and Mentor. These cameras are superior to the conventional fold-
ing type because the lensboard is supported top and bottom, but
the ideal stereo camera is of rigid construction. A slight displace-
ment of the lens in a monocular camera is of little importance,
but in the stereo camera such displacement, because of the mov-