Deviating an incident beam without inverting or reversing to 90°
Commonly used in Plumb Level, Surveying, Alignment, Rangefinding, Optical Tooling and Single Reflection Camera.
A five-side prism containing two reflecting surfaces at 45°to each other, and two refracting faces perpendicular to the entering and emerging beams.
Deviating an incident beam without inverting or reversing by 90° .
The reflecting surface enhanced aluminum coated with black paint overcoat for protection.
A constant deflection device. Commonly used as an "optical square" in Surveying, Alignment machinery, as an end- mirror in Rangefinder, Optical Tooling and Single Reflection Camera.
Manufacturing Tolerances
Attribute |
Commercial standard |
Precision Standard |
Material |
BK7, fine annealed |
BK7, fine annealed |
Beam Deflection |
90°±3',90 °±1' |
90°±30”, 90°±5” |
Dimensional Tolerance |
+/- 0.25 mm |
+/- 0.15 mm |
Angles Tolerance |
90°±3'or ±1' |
90°±30”or±5” |
Flatness |
λ/2 |
λ/4 ,λ/10 |
Cosmetics (Scratch-dig) |
80-50,60-40 |
20-10,10-5 |
Edges |
Fine ground and beveled |
Fine ground and beveled |
Clear Aperture |
90% Reflecting |
90% Reflecting |
Coating |
See attached coating chapter |
See attached coating chapter |
 |
 All dimensions are in mm unless otherwise specified.
Different material, sizes, tolerance and coating are available upon request. |
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