12.7mm Diameter -50mm Focal Length BK7 Plano-Concave Lens
12.7mm diameter -50mm focal length BK7 Plano-Concave lens
Plano Concave Lenses have a negative focal length and they cause parallel rays to diverge when exiting the lens. They are used to expand light beams or to increase focal lengths in optical systems or other applications.
Technical Specifications:
| Material | BK7,Fused Silica,Sapphire,CaF2 |
| Dimension | 5-300mm circular or square |
| Dimension Tolerance | +/-0.15mm, +/-0.2mm, +0/-0.1mm as request |
| Centration | <3' |
| Surface Quality | 40/20 |
| Flatness | lambda/4 per 25nm at 632.8nm |
| Focal length | +/-3% |
| Edge | Fine ground and beveled |
| Coating | Anti-Reflective (AR) Coatings,Single layer MgF2 coating,Multilayer Broadband AR Coating |
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