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The opaque projector, epidiascope, epidiascope or episcope is a precursor to the overhead projector. It displays opaque materials by shining a bright lamp, frequently limelight, onto the object from above.

A system of mirrors, prisms and/or imaging lenses is used to focus a representation of the material onto a presentation screen. For the reason that they must project the reflected light, opaque projectors necessitate brighter bulbs and larger lenses than overhead projectors.

Care must be taken that the materials are not broken by the heat generated by the light resource. Opaque projectors are not as frequent as the modern "overhead".

Opaque projectors are classically used to project descriptions of book pages, drawings, mineral specimens, leaves, etc. They have been created and marketed as artists' enlargement tools to let images to be transferred to surfaces for example prepared canvas, or for lectures and discourses.

In the near the beginning and middle parts of the 20th century, low-cost opaque projectors were created and marketed as toys for children.

In educational settings, the exact role of the opaque projector has been outmoded by the presenter, a lighted table with a unchanging video camera above it. The representation from the camera is displayed by a separate projector. The desktop presenter unit every so often called an opaque projector.

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