E-62-485 12.5mm Dia x -20mm FL VIS 0° Coated, Negative Achromatic Lens
E-62485 12.5mm Dia x -20mm FL VIS 0° Coated, Negative Achromatic Lens
Diameter (mm): 12.50 +0.0/-0.025
Effective Focal Length EFL (mm): -20.00
Focal Length Tolerance (%): ±1
Back Focal Length BFL (mm): -22.88
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 11.50
Centering (arcmin): <1
Center Thickness CT 1 (mm): 2.00
Center Thickness CT 2 (mm): 3.50
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): -13.80
Radius R2 (mm): 9.99
Radius R3 (mm): 109.48
Edge Thickness ET (mm): 7.01
f/#: 1.6
Numerical Aperture NA: 0.31
Coating: VIS 0° (425-675nm)
Coating Specification: Ravg ≤0.4% @ 425 - 675nm
Power (P-V) @ 632.8nm: 1.5λ
Irregularity (P-V) @ 632.8nm: λ/4
Bevel: Protective bevel as needed
Type: Negative Achromatic Lens
Wavelength Range (nm): 425 - 675
Product Family Description
- VIS 0° and VIS-NIR Coatings
- 6.25 – 25mm Diameter Options
TECHSPEC® Broadband AR Coated Negative Achromatic Lenses are corrected for color and on-axis aberrations. These lenses, consisting of two optical elements cemented together, are commonly used as Barlow lenses to extend focal lengths. TECHSPEC® Broadband AR Coated Negative Achromatic Lenses are available in various diameter sizes and VIS 0° or VIS-NIR coating options.