How to View Stereo Pictures

Stereoscopic images, sometimes erroneously called 3D images, aren’t an entirely modern idea: stereo picture cards and viewers were very popular in Victorian and Edwardian times, allowing people at home to view locations in Britain, as well as more exotic places abroad. The most common format was a card roughly 175 mm wide and 90 mm high, as shown below, with the centres of two separately-photographed images centred around 70mm apart, close to the spacing of human eyes, and viewed by means of a simple hand-held viewer.

Stereo Picture Card

The images provided here are mainly of this format.

To see the full stereo effect, the viewing size and distance requires careful adjustment. In order of preference, stereo pictures can be viewed by:

  1. Employing a large computer display and a hand-held prismatic viewer, such as the stereoscope available at http://nvp3d.com/en/shop. Sit away from the screen and you should see a full-resolution stereo image.
  2. Using a mobile device and a hand-held viewer, such as the Lite Owl 3D-Viewer, designed by Brian May of Queen fame and available from https://www.londonstereo.com. For best results you’ll need to view the image in landscape mode on a device that can provide a screen width of between 140 and 155 mm. Adjust the size of the image to be in this range, ensuring that none of the tops or bottoms of the two picture are lost. This does work, but pixellation may occur, caused by the limited resolution of your mobile device.
  3. As above, not using the 3D-Viewer, but making some kind of mount to secure your mobile phone in a traditional Victorian viewer. Once again, pixellation may be visible.
  4. Making or buying a ‘Google Cardboard’ viewing device to hold your mobile phone. This has the same limitations as option 2) and may prove even more difficult for some users, as the distance between the screen and viewing lenses can't be adjusted.
  5. Printing out the stereo images and gluing each pair to a card roughly 175 mm wide by 90 mm high, so as to match the format of a Victorian card, which can then be viewed with an appropriate stereo viewer.

Note that different types of viewer have different centre spacings for each eye. The spacing of human eyes ranges between 54 and 74 mm, with an average of 62 mm, so the suitability of a particular viewer may vary with the individual concerned. Victorian viewers typically have a spacing of 55 mm, perhaps more suited to the people of that age, whilst modern viewers, such as the prismatic viewer mentioned above, later metal viewers, the VistaScreen 3D Viewer and View-Master range all have a spacing of around 65 mm, which is close to the average. The Lite Owl 3D-Viewer, on the other hand, is nearer to 80 mm, as it's intended to be used at a varying distance from the user’s eyes.

©Ray White 2020