Penta prism can turn light 90° without image rotation or mirror reflection, and the 90° turning will not change due to different prism positions, so it is very convenient for assembly. Penta prism is widely used in levels and rangefinders, and can also be used in SLR cameras.
| Material | K9 |
| Size | 7x7mm--25.4x25.4mm |
| Dimensional tolerance | ±0.25mm |
| Surface flatness | <insertion/4@632.8nm |
| Reflectivity | High reflectivity of dielectric or metal film, R>90%@630-680nm |
| Surface quality | 20-10 |
| Clear aperture | >90% |
Designed to reflect light from the camera's lens into the viewfinder, a pentaprism is an essential part of DSLR cameras. This prism with five sides makes sure that the image visible in the viewfinder is positioned accurately in both the vertical and horizontal directions. The pentaprism enables photographers to construct their photographs confidently and accurately by rerouting the light stream at exact angles. It is an essential tool for both professional and amateur photographers due to its unique ability to retain image orientation without inversion, which distinguishes it from simpler mirror systems.
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