Penta Prism
A penta prism made of N-BK7 glass that deviates an incident beam by exactly 90 degrees regardless of prism orientation, used in viewfinders and precision alignment systems. Falls under HTS 9001.90.50.00 as an unmounted optical prism with roof surfaces for maintaining image orientation. Critical component maintaining constant deviation angle in surveying instruments.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If specifically for laser alignment systems
Laser-related optical elements may classify under heading 9013 per chapter notes.
If mounted in complete viewfinder assembly
Prisms become parts of optical instruments when mechanically assembled per note 2(b).
If molded plastic replica for educational use
Non-glass, non-optical quality prisms classify by material under plastics heading.
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Import Tips & Compliance
• Document roof angle precision (typically 90° ± 3 arc seconds) to establish optical quality classification
• Include AR coating specifications if pre-coated, noting that unmounted status refers to mechanical mounting
• Avoid bulk packaging that risks roof edge damage; use individual protective containers
Related Products under HTS 9001.90.50.00
Right Angle Prism
A right angle prism made of optical glass with polished surfaces used to redirect light beams by 90 degrees through total internal reflection. It falls under HTS 9001.90.50.00 as an unmounted optical prism designed for beam deviation in laboratory and industrial optical systems. These prisms are essential components in periscopes, binoculars, and laser systems.
Equilateral Dispersion Prism
An equilateral prism typically made of flint glass used for dispersing white light into its spectral components in spectrophotometers and educational optics kits. Classified under HTS 9001.90.50.00 as an unmounted optical element specifically engineered for chromatic dispersion. Provides high dispersion for separating wavelengths in analytical instruments.
Dove Prism
A Dove prism used for image rotation in optical systems, featuring a 45-degree cut angle and total internal reflection on elongated faces. Classified under HTS 9001.90.50.00 as an unmounted optical prism for precision image orientation control. Essential in polarization microscopes and aerial photography systems.
Porro Prism
Pair of right-angle prisms arranged to invert and revert images in binoculars, providing upright viewing with wide field of view. Falls under HTS 9001.90.50.00 when imported unmounted as individual optical elements rather than assembled binocular sets. Enables stereoscopic vision in field glasses and spotting scopes.
Amici Roof Prism
A compound prism combining right-angle reflection with roof prism functionality for erecting images in compact optical instruments. Classified under HTS 9001.90.50.00 as an unmounted optical prism featuring both total internal reflection and roof reflection surfaces. Used in compact binoculars and prism binoculars.
Wollaston Prism
A birefringent prism composed of two calcite prisms cemented together to separate orthogonally polarized light beams. Falls under HTS 9001.90.50.00 as an unmounted optical prism for polarization applications in microscopy and ellipsometry. Produces widely separated ordinary and extraordinary beams for polarimetric analysis.