E-49-339 18mm Dia. x 27mm FL ,VIS-NIR Coated, Achromatic Lens
E-49339 18mm Dia. x 27mm FL ,VIS-NIR Coated, Achromatic Lens
Diameter (mm): 18.00 +0.0/-0.025
Effective Focal Length EFL (mm): 27.00
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 21.74
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 17.00
Centering (arcmin): <1
Center Thickness CT 1 (mm): 7.67
Center Thickness CT 2 (mm): 1.60
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): 18.70
Radius R2 (mm): -13.11
Radius R3 (mm): -119.12
Edge Thickness ET (mm): 6.62
Surface Quality: 40-20
f/#: 1.5
Numerical Aperture NA: 0.33
Coating: VIS-NIR (400-1000nm)
Coating Specification:
Rabs ≤0.25% @ 880nm
Ravg ≤1.25% @ 400 - 870nm
Ravg ≤1.25% @ 890 - 1000nm
Ravg ≤1.25% @ 400 - 870nm
Ravg ≤1.25% @ 890 - 1000nm
Power (P-V) @ 632.8nm: 1.5λ
Irregularity (P-V) @ 632.8nm: λ/4
Bevel: Protective bevel as needed
Type: Achromatic Lens
Wavelength Range (nm): 400 - 1000