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an optical system for projecting onto a screen images of opaque objects, such as hardware, technical drawings, illustrations, and photographs.

The basic optical diagram of an episcope is shown in Figure 2 in PROJECTOR. In an episcope, the object whose image is being projected reflects diffusely the light rays striking it; thus, only a small amount of the reflected light enters the projection lens. The brightness of the image is enhanced by using one or more powerful light sources as well as high-transmission projection lenses with relative apertures of up to 1:1.5–1:2. Since the focal lengths of episcope lenses are usually shorter than those of diascope lenses, the magnification produced by an episcope is lower. A mirror located above or behind the projection lens of an episcope inverts the image so that it is right side up when it appears on the screen (see: Figure 1). A special cooling system is required in an episcope because of the intense heat that is generated.

An episcope may be a component of the optical system of the alterable projectors known as epidiascopes, which can project images of both opaque and transparent objects onto a screen.

References in periodicals archive ?
Patriarch Pavle approached this issue based on the consent of all Orthodox churches (Decision of the Orthodox Primates in 1992), taking into account the positions of both the SOC's episcopes and believers and Yugoslav state.
Between 300 and 50 metres the T40 is provided with episcopes for direct view and with a 360[degrees] situational awareness system made of three elements each containing three Low Light CCD cameras covering 40[degrees] each, thus providing full clay and night coverage.
To provide him with a good situational awareness the vehicle is not equipped with typical tracked APC episcopes, but with an elevated dome with windows on 180[degrees], ensuring good visibility front and left and lesser visibility on the right.
Compared to most infantry fighting vehicles of its category, the Pars 8x8 features a side-by-side seating front cabin for the driver and commander who can control the surroundings on their flat screens with imaging provided by the front and rear thermal and CCD cameras, though three front and two side episcopes provide direct vision.