In the article ‘From the pinhole camera to the shape of a lens: the camera-obscura reloaded’ ( Phys.
Educ . 50 [http://dx.doi.org/10.1088/0031-9120/50/6/706] 706
[http://dx.doi.org/10.1088/0031-9120/50/6/706] ), the authors show that a prism array, or an
equivalent lens, can be used to bring together multiple camera obscura images from a pinhole array.
It should be pointed out that the size of the camera obscura images is conserved by a prism array,
but changed by a lens. To avoid this discrepancy in image size, the prism array, or the lens, should
be made to touch the pinhole array.