Azograscope is an optical device for magnifying flat pictures that also enhances the sense of thedepth shown in the picture. It consists of a largemagnifying lens through which the picture is viewed. Devices containing only the lens are sometimes referred to asgraphoscopes. Other models have the lens mounted on a stand in front of an angledmirror. This allows someone to sit at a table and to look through the lens at the picture flat on the table. Pictures viewed in this way need to be left-right reversed; this is obvious in the case of writing. A print made for this purpose, typically with extensivegraphical projection perspective, is called avue d'optique or "perspective view".
Zograscopes were popular during the later half of the 18th century as parlour entertainments.[1] Most existing ones from that time are fine furniture, with turned stands, mouldings, brass fittings, and fine finishes.
According toMichael Quinion, the origin of the term is lost, but it is also known as adiagonal mirror, as anoptical pillar machine, or as anoptical diagonal machine.[2]
In Japan, the zograscope became known as和蘭眼鏡 (Oranda megane, 'Dutch glasses') or覗き眼鏡 (nozoki megane 'peeping glasses'), and the pictures were known as眼鏡絵 (megane-e, 'optique picture')繰絵 (karakuri-e 'tricky picture').
Zograscopes created an unprecedentedly realistic experience of depicted scenes, so much so that Blake (2003) described it as "virtual reality".[5] A zograscope allowed viewers to move their eyes over very large scenes, yielding an immersive experience.
Koenderink et al. (2013) showed that viewing photographs with a zograscope allowed observers to see depicted objects, such asRodin'sDanaid (Rodin), in objectively measured depth.[11]
Magnification of images was well understood by the time the first devices were constructed in the early 18th century. Basically, the image is placed at thefocal point of abiconvex or plano-convex lens (amagnifying glass) allowing someone to view the magnified image at varying distances on the other side of the lens.[11] Court and von Rorh (1935) suggested that the popularity of the early French models was because they allowedpresbyopic purchasers to see the images clearly despite the French fashion against wearing glasses.[9] But Chaldecott (1953) doubted this could have been the sole reason for the devices' enduring popularity, leaving the major factor to be the realistic appearance of the depicted images.[3]
A zograscope makes a realistic experience for someone looking through it is by enhancing depth perception. One way is by minimizing otherdepth cues that specify the flatness and pictorial nature of the picture. The image is magnified, perhaps giving it avisual angle similar to the real scene the picture is depicting. The edges of the picture are blocked by the frame of the lens. The light coming from the lens to theeye iscollimated, preventingaccommodation. In early prints of interior scenes, some objects were hand-tinted withsaturated colors whereas the background was tinted with "a pale wash"[5] exploitingcolor contrast as a depth cue.[12]
A second way a zograscope could enhance depth perception is by creatingbinocular stereopsis. Because each eye views the image from a different position, the surface of the picture could havebinocular disparity from different magnification for the two eyes or from differences in the rotation of the images received by the eyes, so-called cyclodisparity.[11] Such disparities create an overall slant of the picture surface around the verticalmeridian[13] or horizontal meridian[14] respectively. As well, coloured parts of the image will be refracted differently for each eye, creating a version ofchromostereopsis. Even if the binocular disparity were incorrect for the surface of the image or any coloured parts of it, the stereoscopic information tends tointegrate with the other depth information in the image.
A simple zograscope can be built from a frame (by cutting a rectangular opening in the bottom of a cardboard box) and placing in the frame a large, magnifying,fresnel lens available from stationery stores. When this is placed over acomputer monitor displaying a photograph of a natural scene, the depicted depth will be enhanced.
