E-49-291 50mm Dia. x 75mm FL, MgF2 Coated, Achromatic Doublet Lens
E-49291 50mm Dia. x 75mm FL, MgF2 Coated, Achromatic Doublet Lens
Diameter (mm): 50.00 +0.0/-0.025
Effective Focal Length EFL (mm): 75.00
Focal Length Tolerance (%): ±2
Back Focal Length BFL (mm): 61.17
Focal Length Specification Wavelength (nm): 587.6
Clear Aperture CA (mm): 49.00
Centering (arcmin): <1
Center Thickness CT 1 (mm): 20.00
Center Thickness CT 2 (mm): 4.50
Center Thickness Tolerance (mm): ±0.2
Radius R1 (mm): 51.88
Radius R2 (mm): -32.79
Radius R3 (mm): -309.45
Edge Thickness ET (mm): 17.07
Surface Quality: 40-20
f/#: 1.5
Numerical Aperture NA: 0.33
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