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| Equi-Concave Glass Lenses |
| The equi-concave lens has a focal length, diverges collimated
incident light, and forms only virtual images that are seen
through the lens. It is often used to expand light beams or
to increase focal length in existing systems, and is normally
used in combination with other lenses. |
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| Specifications |
| Dimensions Tolerance |
+0.0/-0.15mm |
| Paraxial Focal Length |
±2% |
| Centration |
3 arc minutes |
| Clear Aperture |
90% |
| Surface Quality |
60/40 |
| Bevel |
0.25mm at 45 deg |
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