Penta Prisms

Penta prisms deviate a line of sight or input beam by precisely 90° without inverting or reversing the image, making them valuable for applications requiring an exact 90° deviation without having to orient the prism precisely.

Precise 90° beam deviation
±30 arc sec accuracy
Image neither inverted nor reversed
Insensitive to alignment

See All Features

	Compare	Description	Compatibility	Drawings, CAD & Specs	Size	Coating Type	Material	Surface Quality	Surface Flatness	Avail.	Price
		BPP-12.7 Penta Prisms Penta Prism, N-BK7, A=B=C=12.7 mm	UNIVERSAL		12.7 x 12.7 x 12.7 mm	Protected Aluminum with black paint overcoat	Grade A N-BK7	40-20 scratch-dig	≤λ/4 at 632.8 nm over the clear aperture		$102
		BPP-25.4 Penta Prisms Penta Prism, N-BK7, A=B=C=25.4 mm	UNIVERSAL		25.4 x 25.4 x 25.4 mm	Protected Aluminum with black paint overcoat	Grade A N-BK7	40-20 scratch-dig	≤λ/4 at 632.8 nm over the clear aperture		$114

Features

Precise 90° Beam Deviation

Penta prisms deviate a line of sight or input beam by precisely 90° (±30 arc sec accuracy). In imaging applications the penta prism will neither invert nor reverse the image. These prisms deviate a beam through the same angle regardless of its orientation to the beam. This makes penta prisms valuable for applications requiring an exact 90° deviation without having to orient the prism precisely. The monolithic design of a penta prism also makes it inherently more stable than a system consisting of two mirrors.

Aluminized Reflecting Surfaces

The geometry of these prisms requires the reflecting surfaces to be coated. The reflecting surfaces of our penta prisms are coated with protected aluminum with a black paint overcoat. The entrance and exit faces are uncoated.