eo_logo
 
Product added to cart
TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. TECHSPEC® components are designed, specified, or manufactured by Edmund Optics. Learn More

20mm Dia. x -20mm FL, Uncoated, Double-Concave Lens

×
Stock #32-990 3-4 days
×
Other Coating Options
×
Quantity Selector - Use the plus and minus buttons to adjust the quantity. +
£15.56 £25.93
Qty 1-9
£15.56 £25.93
Qty 10+
£14.03 £23.38
Volume Pricing
Request Quote
Prices shown are exclusive of VAT/local taxes
Get Product Downloads
Diameter (mm):
20.00 +0.0/-0.025
Effective Focal Length EFL (mm):
-20.00
Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More
f/#:
1.00
Numerical Aperture NA:
0.50
Coating:
Uncoated
Type:
Double-Concave Lens
Wavelength Range (nm):
400 - 2500
Back Focal Length BFL (mm):
-20.55
Bevel:
Protective bevel as needed
Center Thickness CT (mm):
2.00
Center Thickness Tolerance (mm):
±0.10
Centering (arcmin):
<1
Clear Aperture CA (mm):
19.00
Edge Thickness ET (mm):
5.03
Focal Length Specification Wavelength (nm):
587.6
Focal Length Tolerance (%):
±1
Radius R1=-R2 (mm):
-31.82
Surface Quality:
40-20
Power (P-V) @ 632.8nm:
1.5λ
Irregularity (P-V) @ 632.8nm:
λ/4

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.