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無鍍膜 | BK7 |
• 無鍍膜
• 透光範圍:350 nm~2000 nm
• 熱膨脹係數:7.5X10-6 / K
Specifications |
Material : | BK7 |
Dimension Tolerance : | +0/-0.2mm |
Thickness Tolerance : | ±0.2mm |
Design Wavelength : | 546.1nm |
Surface Quality : | 60/40 scratch and dig |
Centration : | <3 arc minutes |
Focal Length Tolerance : | ±2% |
Clear Aperture : | >90% |
Coating : | None |
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