Penta prism have two important properties. The first is that as the image is deviated by 90 degrees it is neither inverted nor reversed. The second is that the penta-prism is a constant deviation prism, meaning that the same exact 90-degree deviation angle applies to all rays transmitted by the useful aperture regardless of the angles between these rays and the optical axis. The deviation is thus independent of the prism orientation, making the penta-prism especially important in application in which prism orientation can’t be precisely controlled. This prism is commonly used in optical tooling, alignment, range finding, surveying, and other instrumental applications.

 BK7 Penta Prisms

Dove prisms are used as image rotators in variety of optic-mechanical system. As the prism is rotated, the image passing through will rotate at twice the angular rate of the prism. Light entering the dove prism must be parallel or collimated, because the length of the prism is four or five times the height of the prism. The hypotenuse face of a dove prism is the face of the largest area. Normally the dove prism is used in the total internal reflection mode, with the hypotenuse face un-aluminized. Cleanliness of this face is important.

 BK7 Penta Prisms

Right-angle prisms are often preferable to an inclined mirror in applications involving severe acoustic or inertial loads. This is because a right-angle prism is easier to mount and deforms much less than a mirror in response to external mechanical stress. Very high transmission can be achieved by using the hypotenuse face in total internal reflection, and by antireflective coating on the entrance and exit faces. Alternatively, the hypotenuse face can be used in external reflection, and coating with a metallic reflective coating.

Right Angle Prisms

It has three mutually perpendicular surfaces and a hypotenuse face, light entering through the hypotenuse is reflected by each of the three surfaces in turn and will emerge though the hypotenuse face parallel to the entering beam regardless of the orientation the incident beam, it is often used to the distance measurement, optical signal process and laser interferometer.

BK7 Retro-Reflectors

Roof prism is combined with a right angle prism and a totally internally reflecting roof and they are attached by them largest aquare surfaces. It can invert and reverse an image, also, deflect the image 90°. Therefore, it is often used in Terrestrial telescopes, Viewing systems and Rangefinders.

Roof Prisms

These two prisms can expand or contract the beam in one direction without any changes in the other direction. By adjusting the angles among the incident beam and two prisms, the shape of the beam can be changed. It is very easy to turn elliptical beam into circular beam.

 Anamorphic Prisms

 Other prisms are available upon request