Colorful Metal TTL Auto Focus AF Macro Extension Tube Ring for Canon EOS EF EF-S 60D 7D 5D II 550D Red

Note: This item has 4 colors: Red， Blue， Siver， Golden， please leave a message to tell us which color you need， or we'll send the color by randomly.

Features:
Support accurate TTL !#!amp!*! Autofocus.
Built-in electric pins.
Compatible with all EF and for Canon EF-S lenses.
Combined of 3 tubes with different length of: 13mm， 21mm， 31mm.
Made of high-quality Aluminum material that is stronger.
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:
Color: Red， Blue， Silver， Golden
Materials: Aluminum， PC， ABS
Compatibility: For all EF and for Canon EF-S lenses
Macro tube size: 6.2 * 8cm / 2.4 * 3.1in (D * H)
Macro tube weight: 146g / 5.1oz
Package size: 9 * 7 * 7cm / 3.5 * 2.8 * 2.8in
Package weight: 185g / 6.5oz

Auto Extension Tube	Distance Reading of Master Lens	Image Magnification Ratio	Field Coverage (cm)	Distance From Lens Front to Subject (cm)	Exposure Factor
13mm	Inf.	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 * Macro Extension Tube Set
1 * Bag
1 * User Manual