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A pentaprism.A perspective drawing showing a roof pentaprism commonly used in a single lens reflex camera (SLR). The image is flipped laterally by the prism.
A pentaprism is a five-sided reflecting prism used to deviate a beam of light by a constant 90°, even if the entry beam is not at 90° to the prism.
The beam reflects inside the prism twice,[1] allowing the transmission of an image through a right angle without inverting it (that is, without changing the image's handedness) as an ordinary right-angle prism or mirror would.
The reflections inside the prism are not caused by total internal reflection, since the beams are incident at an angle less than the critical angle (the minimum angle for total internal reflection). Instead, the two faces are coated to provide mirror surfaces. The two opposite transmitting faces are often coated with an antireflection coating to reduce spurious reflections. The fifth face of the prism is not used optically but truncates what would otherwise be an awkward angle joining the two mirrored faces.
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A cutaway view of a Praktica L2 showing the pentaprism. In surveying a double pentaprism (two pentaprisms stacked on top of each other) and a plumb-bob...
viewfinder systems of various single-lens reflex cameras instead of the pentaprism. It is used to reverse again the laterally reversed image coming from...
standard and the pentaprism was an optional extra. The retail price in the UK in 1960 was about £48. Type B, body back open Type B, with pentaprism finder Type...
identical or nearly so. Differences include: A much larger and brighter pentaprism viewfinder with approx. 96% coverage. This arrangement, borrowed from...
preferred over a prism. A prism diagonal uses a simple 90°-angle prism, pentaprism, or an Amici roof prism rather than a mirror to bend the optical path...
SP. The prototype model, in particular, was an SP with a mirror box, pentaprism and larger lens mount grafted on. The F was a modular system camera, with...
The optical square uses a pentaprism to reflect and refract a beam or sighting 90 degrees, it is used in pairs in surveying and in a singular block in...
is derived from the combination "PENTaprism" and "contAX", in the same way that "Pentacon" was taken from "PENTAprism" and "CONtax". It's known that the...
units. The "Nikkormat accessory shoe" must be screwed to the top of the pentaprism cover via the eyepiece first. Note that this shoe only mounts the flash...
and was refined in 1948 with the Contax S, the first camera to use a pentaprism. Prior to this, all SLRs were equipped with waist-level focusing screens...
Dresden Zeiss Ikon Kamerawerke and Pentagon (Greek for pentagon), because a pentaprism for SLR cameras developed for the first time in Dresden has this shape...
shutter, interchangeable lenses and a pentaprism eye-level finder. It was the world's first SLR equipped with a pentaprism, with a final presentation in April...
after the prominent light meter window above the lens, in front of the pentaprism.: 95 The camera was aimed at the high-end and professional markets; in...
stabilisation for movies) and bluetooth, the 80D has better weather sealing, pentaprism viewfinder and has Focus Microadjustment (AFMA). The 77D includes a similar...
originally a registered trademark of the East German VEB Zeiss Ikon (from "Pentaprism" and "Contax") and acquired by the Asahi Optical company in 1957. Since...
fast normal lenses, and neither of the two viewfinders (an eye-level pentaprism or folding waist-level finder) had an internal light meter.: 105 These...
leaf shutter. Its viewfinder unit could also be exchanged – there were pentaprism and waist-level finders. The Ambiflex was equipped with a coupled selenium...
interchangeable pentaprism finders. The Narciss camera was initially designed for medical use, it included a Narciss with ordinary pentaprism finder and a...
SLRs of the time, the EOS 300 used a pentamirror viewfinder instead of a pentaprism, and had a polycarbonate body. The autofocus capabilities of this camera...
optical path to direct the light from the lens via a viewing screen and pentaprism to the eyepiece. At the time of exposure, the mirror is flipped up out...
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