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E-45-251 12.5mm Dia x 20mm EFL Hastings Triplet Achromatic Lens

Fosco Connect Part No.: E-45251

  • $ 196.00 or

E-45251 12.5mm Dia x 20mm EFL Hastings Triplet Achromatic Lens

Product Coating Curve

Product ISO

Product Drawing

Diameter (mm): 12.50 +0.0/-0.025
Effective Focal Length EFL (mm): 20.00
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 16.31
Focal Length Specification Wavelength (nm): 587.6
Centering (arcmin): <3
Center Thickness CT (mm): 10.18
Center Thickness A (mm): 7.98
Center Thickness B (mm): 1.10
Center Thickness Tolerance (mm): ±0.3
Radius R1 (mm): 14.95
Radius R2 (mm): 7.34
Radius R3 (mm): -7.34
Radius R4 (mm): -14.95
Edge Thickness ET (mm): 7.44
N-F2 / N-BK7 / N-F2
Surface Quality: 40-20
f/#: 1.6
Numerical Aperture NA: 0.31
Coating: MgF2 (400-700nm)
Coating Specification: Ravg ≤1.75% @ 400 - 700nm
Power (P-V) @ 632.8nm: 1.5λ
Irregularity (P-V) @ 632.8nm: λ/4
Bevel: Protective bevel as needed
Type: Achromatic Triplet Lens
Wavelength Range (nm): 400 - 700

Product Family Description

  • Unique, 3-Element Design
  • MgF2 Coated
  • Steinheil Triplet Achromatic Lenses also Available

TECHSPEC® Hastings Triplet Achromatic Lenses feature a unique, three-element design that provides for distortion free, color-correct viewing. These lenses are computer designed to interact with each other, contributing to the reduction or elimination of “pincushion” distortion and chromatic and spherical aberrations. TECHSPEC® Hastings Triplet Achromatic Lenses are composed of two concave meniscus elements cemented to a double-convex lens.



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