Attribute | Manufacturing Limits |
|---|---|
| Diameter | +0.000/-0.010 mm |
| Center Thickness | ± 0.010 mm |
| Sag | ±0.010 mm |
| Clear Aperture* | Up to 99% |
| Radius (larger of two) | ±0.025% or 1 fringe |
| Irregularity - Interferometer | 0.05 waves PV |
| Irregularity - Profilometer | 1 fringe PV |
| Irregularity - CMM | ±1 micron PV |
| Wedge, ETD | 0.001 mm |
| Scratch Dig (ISO 10110-7:2017) (Mil-Spec 13830B) | 10-5 |
| Surface Roughness** | 5 Å rms |
| Dome Concentricity | 5 microns |
| (Larger sizes and tighter tolerances available) * Standard clear aperture 90% ** Aspheres are 20 Å rms | |
| An aspheric lens is a type of lens whose surface profiles are not portions of a sphere or cylinder. Unlike traditional spherical lenses, aspheric lenses have a more complex surface profile that gradually changes curvature from the center to the edge. Most axial symmetric aspheres are defined by the following equation: |  |
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| z is the height change (or sag), S is the distance from the center of the optic, c (or curvature) is equal to 1/ radius of curvature, and A1, A2, A3, etc. are the aspheric deformation constants. Where the conic constant (K) changes to produce the following shapes: Hyperbola K < -1, Parabola K = -1, Ellipse -1 < K < 0, Sphere K = 0, Oblate Spheroid K > 0 Note: If both K and A1 are zero, the equation represents a spherical surface. |
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Optical Manufacturing Tolerance Chart
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