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The roof or Amici prism deviates or deflects the image through an angle of 90 degrees. It is a right-angle prism whose hypotenuse has been replaced by a 90-degree TIR roof. Glass that does not contribute to the clear aperture has been trimmed away to reduce
size and weight.

• Roof prisms are suitable for applications that demand both right-angle deflection and image erection (a combination left-to-right angle deflection and top-to-bottom inversion, equivalent to a 180 degree rotation about the optical axis).
• These are normally uncoated for use in TIR mode.
• Protected aluminum or internal silver coatings may be specified for roof surfaces when used in wide field applications beyond TIR limits.
• Antireflection coated entrance and exit faces are also available. 

General Specifications:

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