Prisms
Optical fibers and optical fiber bundles; optical fiber cables other than those of heading 8544; sheets and plates of polarizing material; lenses (including contact lenses), prisms, mirrors and other optical elements, of any material, unmounted, other than such elements of glass not optically worked: > Other: > Prisms
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified 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.
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.
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.
Fresnel Rhomb Prism
A 45-90-45 degree prism using total internal reflections to convert linear polarization to circular polarization. Classified under HTS 9001.90.50.00 as an unmounted optical element for polarization state control in laser systems. Provides broadband quarter-wave phase retardation through double internal reflections.
Corner Cube Prism
A solid glass prism with three mutually perpendicular faces that retroreflects incident light parallel to itself regardless of angle of incidence. Falls under HTS 9001.90.50.00 as an unmounted optical prism used in surveying, laser ranging, and alignment systems. Provides position-insensitive retroreflection for distance measurement.
Schlieren Prism
High-precision wedge prism used in schlieren imaging systems to visualize density gradients in fluids and shock waves. Classified under HTS 9001.90.50.00 as an unmounted optical prism with exact wedge angle control. Essential for aerodynamic and heat transfer research applications.
Anamorphic Prism Pair
Matched pair of wedge prisms used to circularize elliptical laser beams by differential expansion in orthogonal directions. Falls under HTS 9001.90.50.00 when imported as unmounted individual prisms. Common in laser diode collimation and beam shaping applications.
Brewster Prism
A prism cut at Brewster's angle to minimize reflection losses when used at specific polarization for laser cavities. Classified under HTS 9001.90.50.00 as an unmounted dispersion prism optimized for p-polarized light transmission. Provides both dispersion and polarization selection in tunable lasers.
Abbe-Koenig Prism
Porro-type prism with air-spaced roof surfaces providing total internal reflection while maintaining high light transmission. Falls under HTS 9001.90.50.00 as unmounted optical prism for high-performance binoculars. Combines image erection with maximum light gathering capability.
Roof Pentagon Prism
Compact five-sided prism combining 90-degree deviation with image erection for ultra-compact optical systems. Classified under HTS 9001.90.50.00 as unmounted optical prism featuring both roof and total internal reflection surfaces. Used in modern digital SLR viewfinders.
Glued Doublet Prism
Two prisms of different dispersion glasses cemented to form an achromatic prism with reduced chromatic aberration. Falls under HTS 9001.90.50.00 as unmounted compound optical prism for spectroscopy applications requiring color correction. Maintains dispersion while minimizing color fringing.