Kingzer cm-PE-AFC Macro Extension Tube Ring Auto Focus AF Plastic for Canon EOS EF EF-S

About this product:

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 TubeDistance Reading of Master LensImage Magnification RatioField Coverage(cm)Distance From Lens Front to Subject(cm)Exposure Factor
13mmlnf.0.2410 * 15211.5
0.5m0.356.9 * 10.3161.8
21mmInf.0.406 * 9132.0
0.5m0.514.7 * 7.0142.3
31mmInf.0.723.3 * 5.07.73.0
0.5m0.832.9 * 4.47.03.4
13+21mmInf.0.643.8 * 5.68.52.7
0.5m0.753.2 * 4.87.53.1
13+31mmInf.0.962.5 * 3.76.03.9
0.5m1.072.3 * 3.45.54.3
21+31mmInf.1.122.2 * 3.35.34.5
0.5m1.232 * 34.95.0
13+21+31mmInf.1.341.8 * 2.74.55.6
0.5m1.471.6 * 2.44.26.1

Package includes:
1 * Plastic Macro Extension Tube Set
1 * Bag
1 * User Manual