Rhomboid prism is a reflecting prism that is rhomboidal in shape.It has two parallel transmitting faces,and two parallel reflecting faces; the latter are oblique to the former(usually but not necessarily at 45°).This prism is capable of off-setting the optical axis without changing the aspect of the image.If the rhomboid prism is rotated around an axis normal to the entrance surface,the offset emergent at axis can be moved parallel to itself in a circullar arc; hence pairs of these prisms often are used to provide inter pupillary adjustment of the eyepiece of binocular instruments such as stereoscopic rangefinders and heightfinders.

Specifications:

Material: BK7 grade A optical glass

Dimension Tolerance: +0.0/-0.10mm

Clear Aperture> 90%

Surface Quality Standard: 60-40 scratch and dig

Precision: up to 20-10 scratch and dig

Flatness: up to λ/10 @632.8nm

Parallelism: up to 5 arc seconds

Angle Tolerance up to 5 arc second

AR Coating: R < 0.2%@center wavelength

Bevel: 0.20mmx45°

Other sizes and coatings are available upon request.