Judas window
Glossary Terms
The name Judas window originates in the British English term for the spy-hole in the door of a prison cell (or originally, a church door).
In reference to SLR cameras, it generally means an arrangement of relay prisms which allow a direct optical view of the current aperture-ring position, visible above or below the main viewfinder image. A small peepsight on the front of the pentaprism is required. Depending on ambient illumination, the clarity of this feature varies.
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