E-32-913 18mm Dia. x 50mm FL, MgF2 Coated, Achromatic Doublet Lens
E-32913 18mm Dia. x 50mm FL, MgF2 Coated, Achromatic Doublet Lens
Diameter (mm): 18.00 +0.0/-0.025
Effective Focal Length EFL (mm): 50.00
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 45.24
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 17.00
Centering (arcmin): <1
Center Thickness CT 1 (mm): 5.00
Center Thickness CT 2 (mm): 2.30
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): 27.12
Radius R2 (mm): -25.66
Radius R3 (mm): -538.70
Edge Thickness ET (mm): 5.69
Surface Quality: 40-20
f/#: 2.78
Numerical Aperture NA: 0.18
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 Lens
Wavelength Range (nm):
400 - 700