Martyn Horner's stereoscopy site

Viewing the pictures

Each picture has three panels. You have two or three options for seeing them in 3-d.

Anaglyph

The first panel is a straightforward red-green anaglyph. Look straight at this through 3d glasses with a red left lens and a green (not blue or cyan) right lens - if you have such a thing to hand.

The colours are not great because they have to be reconstructed by the eye after being separated and passed through coloured lenses. A red object will be red in the left eye but black in the right; so your eyes have to add the two together while also lining them up for the 3-d effect.

Cross-eyed viewing

Probably the easiest: just look towards the division between the second and third panels and cross your eyes until the images merge - in glorious 3d!

The only problem with cross-eyed viewing (apart from the mild discomfort) is that crossing your eyes causes your brain to imagine objects close to your face and this tends to make things look like models rather than real things.

Free viewing

There is another way of viewing stereoscopic pictures. You start with the left eye image on the left and the right eye image on the right and you attempt to point your eyes at their respective images. This is possible (with practice) if the images are about 60mm apart (as are your eyes most probably). If they're bigger (as these generally are), it's a pain in the eye muscles. Nevertheless this is the 'right' way to view stereo pairs as it gives the right feeling of scale.

Another way is to use a viewer: a contraption with shallow prisms that 'aims' your vision outwards. If you have one (or want to try free viewing after reducing the browser window), click on the Change to free viewing link at the top-right of any page and the two images will switch over. Click on the link to see what I mean.