E-49-345 18mm Dia. x 75mm FL, VIS-NIR Coated, Achromatic Lens
E-49345 18mm Dia. x 75mm FL, VIS-NIR Coated, Achromatic Lens
Diameter (mm): 18.00 +0.0/-0.025
Effective Focal Length EFL (mm): 75.00
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 72.15
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 17.00
Centering (arcmin): <1
Center Thickness CT 1 (mm): 3.27
Center Thickness CT 2 (mm): 2.00
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): 53.03
Radius R2 (mm): -32.72
Radius R3 (mm): -288.05
Edge Thickness ET (mm): 4.36
Surface Quality: 40-20
f/#: 4.17
Numerical Aperture NA: 0.12
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