PokeScope® Pocket Stereoscope
A Modern Stereoscope for Computers and Prints
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The PokeScope StereoScope

The PokeScope stereoscope was designed to make viewing any sized stereo image easy!  Endorsed by photographers and scientists, it has quickly become a standard for viewing stereo images on computer screens.

The PokeScope stereoscope can be use for viewing

  • Full-screen stereo images on your computer
  • Large print stereographs
  • 4"x6" stereo prints from photo processors
  • Traditional stereo cards
  • Stereo images on TV screens
  • Projected stereo images
  • Glass prism windows for a clear view, low distortion, and easy cleaning
  • Durable ABS plastic construction
  • Folds into a protective shape which easily fits into a pocket

Size 2" x 2" x 1.3"

News! The PokeScope 3D viewer proudly wins a best product award at the International Stereoscopic Union's 2003 Congress in Besancon France!

"... for the quick fusion of nearly any format pair --or several pairs at once-- the PokeScope is one of the best designed and crafted devices ever to reach the market."
-- says Stereo World Magazine, Vol 27, No 4.

"The ultimate pocket stereoscope to view any size stereographs."
-- Shab Levy, Vice President, National Stereoscopic Association

"... this device allows me to view all kinds of three dimensional images, like out of books, on the net, oversize, undersized. I just love it !"
-- Larry Ferguson, Ferguson Studio

"I use it all the time. Whenever I see a stereo pair on the web, I reach for my PokeScope."
-- Greg Dinkins, New York Stereoscopic Society

"Mechanically, the design is inspired and a work of art ..."
-- John Goodman, Kansai Stereo Club, Japan

More Info

How the PokeScope Stereoscope Works
Relationship to the Holmes-Bates Stereoscope
Optimizing the Design of the PokeScope Stereoscope
Suggested Uses

How the PokeScope Stereoscope Works:

Stereo image pairs are composed of two images showing slightly different views of a subject.  In order to view stereo images, each eye must be presented with the corresponding image in the stereo pair.  When viewing stereo images, the differences in the views obtained from each eye create the perception of depth. 

The PokeScope stereoscope uses glass prisms to bend the light coming from each image of the stereo pair.  This allows your left eye to view the left image of a stereo pair while your right eye is viewing the right image -- the images appear superimposed on top of each other allowing the perception of depth.  The design of the PokeScope stereoscope is optimized to fully mask the periphery around the images to give you the highest quality view.

Relationship to the Holmes-Bates Stereoscope:

The PokeScope stereoscope is related to the classic Holmes-Bates stereoscope which became popular in the early part of the 20th century.  The Holmes-Bates stereoscope was invented by Oliver Wendall Holmes and Joseph Bates in order to optimize the viewing of  printed stereo cards of a standard size.  The PokeScope stereoscope viewer was invented by Dr. Monte Ramstad from 1998-2000 in order to optimize a prism-based stereoscope for viewing any size stereo image.

The Holmes-Bates stereoscope uses lenses to magnify and superimpose the stereo images printed on traditional stereo cards.  It incorporates a central septum or half window which masks out the opposite-side images of the stereo pair.  In the Holmes-Bates stereoscope, the focal lengths of the lenses guide the user to place the stereo card the correct distance from the stereoscope.  If the image is too far from the focal point, the user will adjust the image distance until the image is in focus.

Unlike the Holmes stereoscope, the PokeScope stereoscope can be used to view stereo images of any size.  This is because the PokeScope stereoscope uses prisms whereas the Holmes stereoscope uses lenses. 

The PokeScope stereoscope is revolutionary in that it introduces a full masking window around the left and right stereo-paired images.  In addition to removing the conflicts between the left and right views, full masking windows determine the field of view which the stereo image should fill.  The fixed field of view guides the user in selecting an appropriate viewing distance for viewing stereo images of a particular size.   For each image size, there is a wide range of viewing distances which are appropriate.   It is the full masking windows which makes the PokeScope stereoscope so dramatically easier to use than other prism stereoscopes. 

Optimizing the Design of the PokeScope StereoScope:

The design of the PokeScope stereoscope did not stop with the inclusion of full masking windows.  Instead, very effort was made to optimize all aspects of its performance. 

In order to increase its portability, the stereoscope was given a novel collapsible structure.  The collapsed form of the stereoscope is a sturdy structure which fits easily in a shirt pocket.  Glass prisms provide great clarity to the view, are durable and easy to clean.  When opening the PokeScope stereoscope, the eyepieces automatically lock into place with the outer shells so that the stereoscope can be fully operated with a single rotational motion while holding the outer shells.

The stereoscope includes additional design features which prevent glare from entering the field of view.  The prisms are double shrouded to prevent reflections from the inner walls from entering the userís view.  The prisms are also set away from the front windows in order to reduce reflections from the prism glass.  Even the beveled regions around the windows were designed to prevent reflections into the user's eyes.  The result of this careful construction is for the user to see a solid black field in a wide region around the stereo image.

Finally, the shape of the PokeScope stereoscope was refined and given the consistent styling expected of a modern consumer product.  With respect to form and function, the PokeScope stereoscope was designed to be a true work of art.

Suggested Uses:

Viewing Stereo Images on a Computer Screen

The PokeScope stereoscope is great for viewing side-by-side stereo images on computer screens.  On computer screens, it is desirable to display the stereo images as large as possible due to the limited pixel density of most monitors.   Also in practice, the stereo images displayed on  computer screens will vary greatly in size.  The PokeScope stereoscope is perfectly suited for this application because of its flexibility in viewing various image sizes. 

Viewing Non-Standard Stereo Prints

The PokeScope stereoscope works great for viewing non-standard stereo prints sizes.  When viewing stereo prints, it is not neccessary for the prints to be perpendicular to the viewer.  For example, with the PokeScope stereoscope, it is easy to view stereo prints lying flat on a table in front of you.  This flexibility makes it much easier to prevent shadows from falling onto the stereo images when viewing them. 

Another advantage of the PokeScope streoscope, is that it is not necessary for the left and right images to be placed directly next to each other.  Instead, the images can be spaced apart to insure good isolation of the stereo view.

Simplified Stereo Photography

The PokeScope stereoscope is relatively insensitive to image misalignment.  This makes it easy to view stereo images taken with two cameras or taken with a single camera on a slide bar.  

A popular method of taking stereo photos of still objects with a single camera is by simply taking two photos of a subject from two different positions.  To do this, first take a photo from one position, then move a small distance to either side and take a second photo. 

Viewing these stereo photos using conventional stereoscopes typically requires a careful cropping and mounting operation.  However, when using the PokeScope stereoscope, many of these photos can be viewed quite comfortably by simply taping them to a stiff sheet of paper or positioning them on a table without cropping them. 

For this reason, the PokeScope stereoscope broadens the appeal of stereo photography not only as a artistic medium, but as a useful tool in any application where the relative position of objects or the structure of a subject needs to be documented.

Viewing Traditional Stereo Cards

The PokeScope stereoscope is also useful for browsing traditional stereo cards.  Just as in the case of viewing prints, it is often convenient to not have to worry about setting up a perfect viewing geometry when browsing stereo cards. The flexibility of the PokeScope stereoscope makes browsing stereo images much easier.

Graphic Media Research, 211 Ridgecrest Drive, Cannon Falls, MN 55009 Phone 507-263-4611

  Patented and Patent Pending Graphic Media Research
PokeScope is a trademark of Graphic Media Research

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