Aberration:

+0.50λ ±λ/16 @ 587nm

Abbe Number (v_d):

64.17

Bevel:

Protective as needed

Clear Aperture (%):

>85

Clear Aperture CA (mm):

21.25

Diameter (mm):

25.00 +0.00/-0.25

Thickness (mm):

4.00 ±0.20

Coating:

Uncoated

Coefficient of Thermal Expansion CTE (10^-6/°C):

7.1 (-30 to +70°C)
8.3 (+20 to +300°C)

Density (g/cm³):

2.51

Edges:

Fine Ground

Index of Refraction n_d:

1.516

Knoop Hardness (kg/mm²):

610

Parallelism (arcmin):

<1

Poisson's Ratio:

0.206

Substrate: Many glass manufacturers offer the same material characteristics under different trade names. Learn More

N-BK7

Surface Quality:

60-40

Type:

Specialty Window

Wavelength Range (nm):

350 - 2200

Young's Modulus (GPa):

82

25mm Dia +0.50λ Aberration, Spherical Aberration Plate

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