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18.5" Diameter, FL -18.0", Negative Fresnel Lens

Stock #46-397
Qty 1-10
Qty 11
Volume Pricing
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Dimensional Tolerance (inches):
Diameter (mm):
Diameter (inches):
Effective Diameter (inches):
Effective Focal Length EFL (mm):
Effective Focal Length EFL (inches):
Center Thickness CT (inches):
Groove Density (grooves/inch):
Thickness Tolerance (%):
Index of Refraction nd:
Operating Temperature (°C):
Transmission (%):
92 (from 400-1100nm)
Fresnel Lens
Wavelength Range (nm):
400 - 1100

Regulatory Compliance

RoHS 2015:
REACH 201:

Product Family Description

  • Negative Focal Length
  • Acrylic Substrate
  • Square and Rectangular Options

A Fresnel lens replaces the curved surface of a conventional lens with a series of concentric grooves, molded into the surface of a thin, lightweight plastic sheet. The grooves act as individual refracting surfaces, like tiny prisms when viewed in cross section, bending parallel rays in a very close approximation to a common focal length. Because the lens is thin, very little light is lost by absorption. Fresnel lenses are a compromise between efficiency and image quality. High groove density allows higher quality images, while low groove density yields better efficiency (as needed in light gathering applications). In infinite conjugate systems, the grooved side of the lens should face the longer conjugate.

Fresnel lenses are most often used in light gathering applications, such as condenser systems or emitter/detector setups. Fresnel lenses can also be used as magnifiers or projection lenses; however, due to the high level of distortion, this is not recommended.

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