E-49-766 25.4mm Dia. x 50.8mm FL, MgF2 Coated, Achromatic Doublet Lens
E-49766 25.4mm Dia. x 50.8mm FL, MgF2 Coated, Achromatic Doublet Lens
Diameter (mm): 25.40 +0.0/-0.025
Effective Focal Length EFL (mm): 50.80
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 44.90
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 24.40
Centering (arcmin): <1
Center Thickness CT 1 (mm): 8.00
Center Thickness CT 2 (mm): 3.50
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): 33.54
Radius R2 (mm): -27.27
Radius R3 (mm): -101.50
Edge Thickness ET (mm): 8.20
Surface Quality: 40-20
f/#: 2.00
Numerical Aperture NA: 0.25
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