Double-Concave (DCV) Lenses have two inward curved surfaces and a negative focal length. They are used for image reduction and to spread light.
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Diameter Tolerance | +0.0/-0.02mm |
Center Thickness Tolerance | ±0.02mm |
Focal Length Tolerance | ±2% |
Surface Quality | 60/40, 40/20 20/10or better.. |
Material | BK7/K9 |
Clear Aperture | >90% |
Centering | <30 arc sec |
Coating | Custom |
Bevel | Protective bevel as needed |