The stereoscope is a tool for viewing a stereocopic pair of separate images, depicting left-eye and rigght-eye views of the same scene, as a single three-dimensional image. The first stereoscope was invented by Wheatstone. It used a pair of mirrors, each reflecting a picture located off to the side.
What’s our purpose with it?
Our purpose to see the two images simultaneously and we can fuse them and with it we can achieve widening illusion.
How is it look like and what is recquired to it?
We can find a lot of different types of stereoscopes and all of these can be used for practice.
A stereoscope is composed of two pictures mounted next to each other, and a set of lenses to view the pictures through. Each picture is taken from a slightly different viewpoint that corresponds closely to the spacing of the eyes. The left picture represents what the left eye would see, and likewise for the right picture. When observing the pictures through a special viewer, the pair of two-dimensional pictures merge together into a single three-dimensional image.
It is a lenticular stereoscope (lens based). This allowed a reduction in size, creating hand-held devices. Brewster utilized lenses to combine the two dissimilar pictures and produce the three-dimensional effect.