E-68-259 25mm Dia x 12.5mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens

Fosco Connect Part No.: E-68259

E-68259 25mm Dia x 12.5mm FL 3-5μm Coated, Hybrid Ge Aspheric Lens

Diameter (mm): 25.00 +0.0/-0.1

Effective Focal Length EFL (mm): 12.50 @ 4000nm

Numerical Aperture NA: 1.00

Back Focal Length BFL (mm): 11.56

Aspheric Design Wavelength (nm): 4000

Coating: BBAR (3000-5000nm)

Coating Specification: R_avg <3.0% @ 3 - 5μm

Surface Accuracy, P-V (μm): 0.3

Centering (arcmin): ≤5

Surface Quality: 60-40

Clear Aperture CA (mm): 24.0

Edge Thickness ET (mm): 1.22

Center Thickness CT (mm): 4.22 ±0.10

f/#: 0.5

Bevel: Protective bevel as needed

Edges: Diamond Turned

Radius R₂ (mm): 440.2

Shape of Back Surface: Convex

Wavelength Range (nm): 3000 - 5000

Conjugate Distance: Infinite

Asphere Figure Error, RMS @ 632.8nm: λ/6