製品の詳細
| Part Number | LAD52.720 | ||
| Diameter (mm): | 20 | Diameter Tolerance (mm): | +0.01/-0.10 |
| Effective Focal Length EFL (mm): | 52.7 | Back Focal Length BFL (mm): | 48.25 |
| Substrate: | N-BK7/N-SF5 or or equivalent | Surface Quality: | 60-40 |
| Power (P-V) @ 632.8nm: | 1.5λ | Irregularity (P-V) @ 632.8nm: | 0.5 Waves |
| Focal Length Tolerance (%): | ±2% | Centering (arcmin): | < 3 minutes |
| Center Thickness CT (mm): | 8.9 | Center Thickness Tolerance (mm): | ±0.2 |
| Edge Thickness ET (mm): | 6.6 | Clear Aperture CA (mm): | >= 90% of Diameter |
| Type: | Achromats | Bevel: | Protective bevel as needed |
