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TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

12mm Dia. x -12mm FL, Uncoated, Double-Concave Lens

Stock #32-988 3-4 days
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Diameter (mm):
12.00 +0.0/-0.025
Effective Focal Length EFL (mm):
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
Numerical Aperture NA:
Double-Concave Lens
Wavelength Range (nm):
400 - 2500
Back Focal Length BFL (mm):
Protective bevel as needed
Center Thickness CT (mm):
Center Thickness Tolerance (mm):
Centering (arcmin):
Clear Aperture CA (mm):
Edge Thickness ET (mm):
Focal Length Specification Wavelength (nm):
Focal Length Tolerance (%):
Radius R1=-R2 (mm):
Surface Quality:
Power (P-V) @ 632.8nm:
Irregularity (P-V) @ 632.8nm:

Regulatory Compliance

RoHS 2015:
Reach 219:
Certificate of Conformance:

Product Family Description

  • Wavelength Range of 350-2200nm
  • Precision Diameter and Centration Tolerances Allow for Easy OEM Integration
  • Wide Variety of Diameters and Focal Lengths
  • Additional AR Coating Options Available: VIS-EXTMgF2, VIS 0°, VIS-NIR, NIR I, and NIR II

TECHSPEC® Uncoated Double-Concave (DCV) Lenses are designed to have two inward curved surfaces and a negative focal length similar to Plano-Concave (PCV) lenses. These lenses can be used for balancing aberrations created by other lenses within a system due to their negative spherical aberration. Double-Concave (DCV) lenses are commonly used in a variety of applications including image reduction, beam expansion and telescopes. TECHSPEC® Uncoated Double-Concave (DCV) Lenses offer optimal performance in the 350nm to 2200nm range.  These lenses are also available VIS-EXTMgF2VIS 0°VIS-NIRNIR I, or with NIR II AR coating options.