Description:

The Commlite Metal AF Extension Tube Set can perfectly transform your Lens into a Macro Lens for great Macro shooting. It drives the lens by film or digital sensor and does not affect aperture and image quality. Meanwhile， it is combined with 3 pieces of different tubes (length: 13mm， 21mm， 31mm) which can either be used separately or in any combinations(totally 7 different combinations) to satisfy your different magnification requirement. Furthermore， the tube is electronic one that can achieve functions of Auto-focus as well as TTL auto exposure by working with all EF and EF-S mount Canon lens.    

Compatibility:

All EF and EF-S Canon lenses

Features:  

  1. Support accurate TTL !#!amp!*! Autofocus;
  2. Built-in electric pins;
  3. Compatible with all EF and EF-S Canon lenses;
  4. Combined of 3 tubes with differentlength of: 13mm， 21mm， 31mm;
  5. Made of brass and Aluminum (not plastic)that is more strong;
  6. Upgraded circuitry to work better with digital SLRs cameras and SLR lenses.
  7. Superior lock pinwhich can tighten the tube joint;
  8. Perfect for macro shooting.
  9. High quality and compact.

Specification:  
•Materials: Copper， Aluminum， ABS
•Net Weight: 256g  

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.
0.5m

0.24
0.35

10x15
6.9x10.3

21
16

1.5
1.8

21mm

lnf.
0.5m

0.40
0.51

6x9
4.7x7.0

13
14

2.0
2.3

31mm

lnf.
0.5m

0.72
0.83

3.3x5.0
2.9x4.4

7.7
7.0

3.0
3.4

13+21mm

lnf.
0.5m

0.64
0.75

3.8x5.6
3.2x4.8

8.5
7.5

2.7
3.1

13+31mm

lnf.
0.5m

0.96
1.07

2.5x3.7
2.3x3.4

6.0
5.5

3.9
4.3

21+31mm

lnf.
0.5m

1.12
1.23

2.2x3.3
2x3

5.3
4.9

4.5
5.0

13+21+31mm

lnf.
0.5m

1.34
1.47

1.8x2.7
1.6x2.4

4.5
4.2

5.6
6.1