| Percent contrast Q for: | 37 mm cold sphere | 28 mm hot sphere | 22 mm hot sphere | 17 mm hot sphere | 13 mm hot sphere | 10 mm hot sphere |
| 16:1 | 47.93% | 43.8% | 36.8% | 21.9% | 28% | 12.2% |
| 8:1 | 48.33% | 53.33% | 73.3% | 69.5% | 57.8% | 35.9% |
| 4:1 | 56.9% | 55.55% | 75.1% | 70.5% | 56.78% | 32.78% |