pentagonal prism

Material: K9, BK7, FS, UVFS, CaF₂, ZnSe

Diameter:3mm-200mm±0.05mm

Center Thickness Tolerance:±0.05mm

Lens Alignment Error:≤3min

Surface Accuracy:λ/ 8 @

Surface Quality:40/20. 60/40. 80/60

Effective Caliber: 90

The pentagonal prism is one of the redirectors for the fixed angle (90°) of the beam. It has two purposes: one is that no matter what the angle of incidence on the first surface is, the outgoing light turns the incident light to a certain angle (90°); the other is that it is different from a right-angle prism and the resulting image is neither There is no specular reflection even when rotating. Penta prisms are often used in camera viewfinders, image observation systems or measuring instruments.

Example with BK7 material：These N-BK7 pentagonal prism are available uncoated or with one of five antireflection coatings (-A, -AB, -B, -C, or -D), which reduces the amount of light reflected from each surface of the lens (see the Selection Guide table below for coating option). Since approximately 4% of the incident light is reflected at each surface of an uncoated substrate, the application of an AR coating improves transmission, which is important in low-light applications, and prevents the undesirable effects (e.g., ghost images) associated with multiple reflections. Having optics that are AR coated on both surfaces is particularly desirable for applications utilizing multiple optical elements. Please see the Graphs tab for additional coating information.

N-BK7 pentagonal prism Selection Guide
Coating name	wavelength band
Uncoated	Uncoated
A Coating	350nm-700nm
AB Coating	400nm-1100nm
B Coating	650nm-1050nm
C Coating	1050-1700nm
D Coating	1650nm-3000nm

Custom pentagonal prism

Hengpu optics business unit has a wide breadth of manufacturing capabilities that allow us to offer a variety of custom pentagonal prisms for both OEM sales and low quantity one-off orders. pentagonal prism with customer-defined sizes, focal lengths, substrate materials, cement materials, and coatings are all available as customs. In addition, we can offer optics that exceed the specifications of our stock catalog offerings. To receive more information or inquire about a custom order, please contact Tech Support : tom@hp-lens.com