Features:
Support accurate TTL & Autofocus.
Built-in electric pins and drives.
Compatibility: for all EF and EF-S Canon lenses.
Combined with 3 tubes in different length: 13mm， 21mm， 31mm; totally 7 different combinations.
Made of high-quality ABS that is more strong.
Upgraded circuitry to work better with digital SLRs cameras and SLR lenses.
Superior lock pin which can tighten the tube joint.
Perfect for macro shooting.
High quality and compact.
Specifications:
Material: Lead， PC， ABS
Color: Black
Macro tube size: 6.2 * 8cm / 2.4 * 3.1in(D * H)
Macro tube weight: 117g / 4.1oz
Package size: 13 * 7 * 7cm / 5.1 * 2.8 * 2.8in
Package weight: 155g / 5.5oz
| Auto Extension Tube | Distance Reading of Master Lens | Image Magnification Ratio | Field Coverage(cm) | Distance From Lens Front to Subject(cm) | Exposure Factor |
| 13mm | lnf. | 0.24 | 10 * 15 | 21 | 1.5 |
| 0.5m | 0.35 | 6.9 * 10.3 | 16 | 1.8 | |
| 21mm | Inf. | 0.40 | 6 * 9 | 13 | 2.0 |
| 0.5m | 0.51 | 4.7 * 7.0 | 14 | 2.3 | |
| 31mm | Inf. | 0.72 | 3.3 * 5.0 | 7.7 | 3.0 |
| 0.5m | 0.83 | 2.9 * 4.4 | 7.0 | 3.4 | |
| 13+21mm | Inf. | 0.64 | 3.8 * 5.6 | 8.5 | 2.7 |
| 0.5m | 0.75 | 3.2 * 4.8 | 7.5 | 3.1 | |
| 13+31mm | Inf. | 0.96 | 2.5 * 3.7 | 6.0 | 3.9 |
| 0.5m | 1.07 | 2.3 * 3.4 | 5.5 | 4.3 | |
| 21+31mm | Inf. | 1.12 | 2.2 * 3.3 | 5.3 | 4.5 |
| 0.5m | 1.23 | 2 * 3 | 4.9 | 5.0 | |
| 13+21+31mm | Inf. | 1.34 | 1.8 * 2.7 | 4.5 | 5.6 |
| 0.5m | 1.47 | 1.6 * 2.4 | 4.2 | 6.1 |
Package list:
1 * Plastic Macro Extension Tube Set
1 * Bag
1 * User Manual