1 Support accurate TTL and Autofocus. 2 Built in electric pins. 3 Compatible with all for EF and EF-S lenses. 4 Combined of 3 tubes with different length of: 13mm, 21mm, 31mm. 5 Upgraded circuitry to work better with digital SLRs cameras and SLR lenses. 6 Superior lock pin which can tighten the tube joint. 7 Suitable for macro photography.Materials:PC, ABS
Compatibility: For EF and EF-S lenses
Macro tube size: 6.2 x 8cm / 2.4 x 3.1in (D x H)
Macro tube weight: 146g / 5.1oz
Auto Extension Tube
Distance Reading of Master Lens
Image Magnification Ratio
Field Coverage (cm)
Distance From Lens Front to Subject (cm)
Exposure Factor
13mm
Inf.
0.24
10 x 15
21
1.5
0.5m
0.35
6.9 x 10.3
16
1.8
21mm
Inf.
0.40
6 x 9
13
2.0
0.5m
0.51
4.7 x 7.0
14
2.3
31mm
Inf.
0.72
3.3 x 5.0
7.7
3.0
0.5m
0.83
2.9 x 4.4
7.0
3.4
13+21mm
Inf.
0.64
3.8 x 5.6
8.5
2.7
0.5m
0.75
3.2 x 4.8
7.5
3.1
13+31mm
Inf.
0.96
2.5 x 3.7
6.0
3.9
0.5m
1.07
2.3 x 3.4
5.5
4.3
21+31mm
Inf.
1.12
2.2 x 3.3
5.3
4.5
0.5m
1.23
2 x 3
4.9
5.0
13+21+31mm
Inf.
1.34
1.8 x 2.7
4.5
5.6
0.5m
1.47
1.6 x 2.4
4.2
6.1

What's in the box
1 x Macro Extension Tube Set, 1 x Bag, 1 x User Manual