| Extension Tube Length (stacked combinations in brackets) | 12mm | 24mm (12+12) | 25mm | 36mm (12+12+12) | 37mm (25+12) | 49mm (25+12+12) | 50mm (25+25) | 62mm (25+25+12) | 75mm (25+25+25) |
| Magnification (size on sensor) | at ∞ | 0.24 | 0.48 | 0.50 | 0.72 | 0.74 | 0.98 | 1.00 | 1.24 | 1.50 |
| at 50cm | 0.35 | 0.59 | 0.61 | 0.83 | 0.85 | 1.09 | 1.11 | 1.35 | 1.61 |
| Brightness Loss (in stops) | at ∞ | 0.6 | 1.1 | 1.2 | 1.6 | 1.6 | 2.0 | 2.0 | 2.3 | 2.6 |
| at 50cm | 0.9 | 1.3 | 1.4 | 1.7 | 1.8 | 2.1 | 2.2 | 2.5 | 2.8 |