X RAY

Definition: electromagnetic radiations beyond ultraviolet which, when passed through a solid object and allowed to act upon a sensitive emulsion, form a shadow image of the internal structure of the object.

X SETTING (X SYNC)

Definition: the setting that causes the flash to burst in synchronization with the shutter. For some manual cameras, the X synch speed refers to the maximum speed that the camera can synchronize with the flash.

XENON

Definition: rare gas sometimes used with electronic flash tubes and enclosed arc light sources.

X RAY FILM

Definition: spectral sheet film for radiography, having a thick emulsion coated on both sides of the support to increase the absorption of X rays.

XEROGRAPHY

Definition: a photographic process which uses an electrically charged metal plate. On exposure to light the electrical charge is destroyed, leaving a latent image in which shadows are represented by charged areas. A powdered pigment dusted over the plate is attracted to the charged areas, producing a visible image.

XOGRAPHY

Definition: a system of photography which produces prints and transparencies with a threedimensional effect. A cylindrically embossed lenticular screen is placed in contact with the film and a shutter behind the lens is arranged to scan the subject during exposure.