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제품
Cylinder
| PARAMETER | SPECIFICATION |
| Material | BK7 / Fused Silica / ZnSe / CaF2 etc |
| Surface Flatness | < LAM/8 @ 633 nm |
| Surface Quality | < 20/10 (both sides) |
| Centration Error | < 2 arcmin |
| Focal Length Tolerance | < +-0.5 % |
| Clear Aperture | > 85 % |
| Coating | Customized |