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GCL-0302 Penta Prisms
Neither inverting nor reversing image
Constant 90° deviation
Penta Prism is a five-side prism, featuring two important properties. First, the image is neither inverted nor reversed while deviated by 90°. Secondly, it is a constant deflecion device; i.e. all the transmitted rays are deviated by the same exact 90 degrees. Slight movement of the prisms does not effect the true right angle. This feature makes the prism useful in range-finders. It is also used in viewfinders of single reflection cameras. The reflecting surface are enhanced aluminum coated with black paint overcoat for protection.
Beam Deflection: 90° ± 3' or ± 30", see table bellow
Material: N-BK7, fine annealed
Dimension: ±0.1mm
Flatness: λ/4 at reflection surface;λ/2 at transmission surface
Surface Quality: 60-40 scratch-dig
Clear Aperture: 90%
Coatings: Reflecting surfaces are aluminum coated with black paint overcoat. Entrance and exit surfaces are MgF2 AR coated.
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GCL-0302 Penta Prisms
| Catalog No. |
a = b = c |
d |
Deflection (90°) |
| GCL-030201 |
20.0 |
21.6 |
± 3 arc min |
| GCL-030202 |
30.0 |
32.5 |
± 3 arc min |
| GCL-030203 |
40.0 |
43.3 |
± 3 arc min |
| GCL-030204 |
40.0 |
43.3 |
± 30 arc sec |
All dimensions are in mm unless otherwise specified.
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