Aluminized Optical Prisms Height 12.7mm Half Penta Prism Used In Telescopes

Brand Name:STAR OPTIC
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Model Number:HPP
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Half Penta Prism, Semipentaprisms, Used In Telescopes

Overview:

Half-Penta prisms also known as Bauernfeind prisms or Semi-pentaprisms are used to deviate the line of sight by 45° without inverting or reverting the image. It is widely used in telescopes and also has applications in projection and imaging system, in microscope tubes, and in geodesy.


The Half-penta prism has the geometrical structure of a penta prism cut in half. The beam is reflected twice in the prism, first with total internal reflection and a second time on a coated reflecting surface. The prism requires aluminized and over-coated with Inconel and black paint for the non-TIR surface to be usable in practice.


Combining a Half-Penta Prism with a correspond size Schmidt roof prism creates a Pechan prism pair. The Pechan prism pair will invert or revert the image while not deviating the line of sight.


General Specifications of Half-penta Prism:

MaterialBK7
Dimension Tolerance±0.2mm
Angle Tolerance<3 arc minutes
Roof Angle Tolerance<3 arc sec
Flatnessλ/4@632.8nm
Surface Quality60/40 scratch and dig
Clear Aperture>90%
CoatingNo coating, available

Standard Products of Half-penta Prism:

PN.Material

A

(mm)

h

(mm)

AR Coating

HR Coating
HPP1212N-BK712.712.7UncoatedUncoated
HPP1616N-BK716.516.5UncoatedUncoated
HPP1820N-BK718.020UncoatedUncoated
HPP1212-450-650-MALN-BK712.712.7AR@450-650nm

Protected Aluminum

HPP1616-450-650-MALN-BK716.516.5AR@450-650nm

Protected Aluminum

HPP1820-450-650-MALN-BK718.020.0AR@450-650nm

Protected Aluminum


China Aluminized Optical Prisms Height 12.7mm Half Penta Prism Used In Telescopes supplier

Aluminized Optical Prisms Height 12.7mm Half Penta Prism Used In Telescopes

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