製品の詳細
| Part Number | LAD5520 | ||
| Diameter (mm): | 20 | Diameter Tolerance (mm): | +0/-0.10 |
| Effective Focal Length EFL (mm): | 55 | Back Focal Length BFL (mm): | 51.57 |
| Substrate: | N-BK7/N-SF5 or equivalent | Surface Quality: | 60-40 |
| Power (P-V) @ 632.8nm: | 1.5λ | Irregularity (P-V) @ 632.8nm: | <0.5λ |
| Focal Length Tolerance (%): | ±2% | Centering (arcmin): | <3 arc min. |
| Center Thickness CT (mm): | 7.4 | Center Thickness Tolerance (mm): | ±0.2 |
| Edge Thickness ET (mm): | 21.6 | Clear Aperture CA (mm): | >= 90% of Diameter |
| Type: | Achromats | Bevel: | Protective bevel as needed |
