from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A five-sided prism used in the viewfinder of some single-lens reflex cameras


from Wiktionary, Creative Commons Attribution/Share-Alike License

penta- +‎ prism


  • The mirror and pentaprism and related mechanisms are expensive to manufacture and maintain.

    Making Light: Open thread 135

  • So I got some black duct tape, covered up the Nikon wording on the pentaprism and got a no name camera strap and lens cap - and suddenly there was no more agro.

    Deter Thieves By Uglifying Your Camera | Lifehacker Australia

  • They get the smaller body by eliminating the pentaprism-and-mirror mechanism common to single-lens-reflex cameras, effectively making this into a point-and-shoot style camera, where the light goes directly from the lens onto the sensor.

    Original Signal - Transmitting Gadgets

  • The white-painted lettering on the pentaprism was totally gone, the black magnesium body was scorched and buckled, and the lens cracked completely through.

    Asimov's Science Fiction

  • The D300S's viewfinder features an eye-level pentaprism with approx. 100% frame coverage and approx.

    Photography Tips

  • The focus screen thickness is irrelevent as the focusing takes place on the ground glass surface which is on top of the screen next to the pentaprism, just the same as the original screen focus would be and therefore has no bearing on the issue.

    News: Digital Photography Review (

  • My second thought was that the pentaprism is out of calibration, but Rachael Katz advises that there is a shim between the focus screen and the pentaprism bottom face and these shims come in various thicknesses so as there is adjustment available!

    News: Digital Photography Review (

  • I would be very careful when doing it as you may damage the bottom of the pentaprism if you are not careful.

    News: Digital Photography Review (

  • The SD15 features a pentaprism viewfinder with 98% (vertical and horizontal) coverage, 0. 9x magnification and an 18mm eye point.

    Digital Photography Now

  • Bright viewfinder image by the incorporation of a pentaprism

    Digital Photography Now


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