Keystone Telebinocular Stereoscope System
Models 46C, 48, and 53

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Photo of Keystone Telebinocular
close up of lenses
Photo of Keystone Telebinocular
front view
Photo of Keystone Telebinocular
rear view
Photo of Keystone Telebinocular
left side view
Photo of Keystone Telebinocular
right side view
Photo of Keystone Model 53
Rotor Control, Model 53
Schematic of Keystone Model 53
Rotor Control, Model 53, schematic

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The outstanding features of this Keystone Telebinocular stereoscope system are

1. high quality achromatic lenses

2. twin "lightboxes" which have two switchable 5-Watt light bulbs for viewing of stereo slides, transparencies, pin-pricked stereographs, etc.

3. built-in twin masks (40mm x 40mm and 47mm x 62mm)

4. A motorized switchbox identified as "Model 53 Rotor Control," which provides a variety of lighting conditions, such as simultaneous or sequential flashing of the right-eye and left-eye stereo slide images at various rates.

I would like to obtain a copy of the manual or catalog of this stereoscope. Please email me if you can help. I believe that this all-metal instrument was manufactured in the early 1950s, but am not sure.

Note that the main front unit of this stereoscope containing the lenses is identified on a small red plate as "Model 46C Ophthalmic Telebinocular." However, it has all the special features of Keystone's Model 46B, so this is another mystery. The combination twin slide carrier and transparency lightbox is identified on its small red plate as "Model 48 Ortho-Trainer." The distance between the left-eye and right-eye lightboxes can be varied by a single knob to--I assume--either test or optimize interaxial distances or eye convergence angles when used with independent stereo slides.

For further information about features of the wonderful Keystone Telebinocular Stereoscope--the "Rolls Royce" of all stereoscopes--click here:

3D by DrT: Visual Survey Telebinocular

Other stereoscopic topics at this website are:

Stereoscopy, its place in fine arts

Bibliography of 3D and stereoscopy

3-D pointillism photo-sculpture, 1972

Ferragallo Design Group

Timothy Leary -- a 1990 stereoscopic 3D portrait

Corrections or additions are welcome.

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