E-49-925 6.25mm Dia. x 17.5mm FL, MgF2 Coated, Achromatic Doublet Lens
E-49-925 6.25mm Dia. x 17.5mm FL, MgF2 Coated, Achromatic Doublet Lens
Diameter (mm): 6.25 +0.0/-0.025
Effective Focal Length EFL (mm): 17.50
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 15.46
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 5.625
Centering (arcmin): <1
Center Thickness CT 1 (mm): 2.75
Center Thickness CT 2 (mm): 1.00
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): 11.13
Radius R2 (mm): -9.22
Radius R3 (mm): -38.49
Edge Thickness ET (mm): 3.18
Surface Quality: 40-20
f/#: 2.8
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