Diameter (mm):

12.50 +0.00/-0.05

Effective Focal Length EFL (mm):

20.00

Back Focal Length BFL (mm):

16.07

Focal Length Specification Wavelength (nm):

587.6

Clear Aperture CA (mm):

11.00

Centering (arcmin):

≤5

Center Thickness CT (mm):

6.58

Center Thickness CT 1 (mm):

5.00

Center Thickness CT 2 (mm):

1.58

Radius R₁ (mm):

13.30

Radius R₂ (mm):

20.00

Radius R₃ (mm):

204.48

Edge Thickness ET (mm):

5.01

N-LAK8 / N-SF57

Surface Quality:

60-40, glass surfaces only

f/#:

1.6

Numerical Aperture NA:

0.31

Coating:

VIS 0° (425-675nm)

Coating Specification:

R_avg ≤0.4% @ 425 - 675nm

Note:

VIS 0° Coating on First Surface, Second Surface is Aspheric Polymer

Operating Temperature (°C):

-20°C to 80°C

Type:

Achromatic Lens

Wavelength Range (nm):

425 - 675

12.5mm Diameter x 20mm EFL Aspherized Achromatic Lens