Penta prisms is a five-side prism, It has black painted metallic or dielectric coating on its two reflective surfaces as standard due to it can not use the function of total internal reflection based on critical angle. Penta Prisms reflects light rays through a 90ºangle by two reflections, without image rotation or inversion. It is commonly used in viewfinders of cameras, image observational systems, Plumb Level, Surveying, Alignment, Rangefinding and Optical tooling.
Item
Specifications
Material
N-BK7（H-K9L)
Dimension A x h
2×2~25×25mm
Dimension tolerance
±0.1mm
90°Deviation tolerance
±2”
Flatness(per φ10mm)
λ/8@632.8nm
Surface quality
MIL60-40
Clear aperture
85%
Bevel(face width×45°)
0.2~0.4mm or
specified by customer
Coating on input and output surfaces
Uncoated,AR
coating ect.