Neewer® Multifunctional Electronic Automatic AF Auto Focus Macro & Reverse Mount On Lens Extension Tube with 58mm 67mm 72mm 77mm Adapter Rings for Canon EF/EF-S Mount Lenses, Fits Canon EOS 5D Mark 3 III 5D Mark 2 II 1Ds Mark IV III II I 1D Mark III II N

Features:
Flexible cable connection.
Reverse and positive mount on lens,realize macro photograpy easily.
Compatible with almost all macro extension tubes and macro bellows.
Canon Mount, for all Canon EOS EF DSLR & Canon EOS EF SLR.
It moves the lens farther from the film or digital sensor. The farther away the lens is, the closer the focus, the greater the magnification.
This extension tube does not affect image quality as there is no optics inside.
In comparison, a close up filters are often blamed for degrading image quality.
Adjustable Length.

Specifications:
Material: Metal
Color: Black
Reverse adapter rings four pieces: 58mm / 67mm / 72mm / 77mm

Compatible with: Canon EOS 5D Mark III, 5D Mark II, 1Ds Mark [IV / III / II / I ], 1D Mark [III / II N/ II / I], 6D, 5D, 7D, 70D, 60D, 50D, 40D, 30D, 100D, 700D, 650D, 600D, 550D, 500D, 450D, 400D, 350D, 300D, 1100D, 1000D

Package Contents:
1 x Extension Tube
1 x 58mm Lens Ring
1 x 67mm Lens Ring
1 x 72mm Lens Ring
1 x 77mm Lens Ring

Remark:
There are no electrical contacts in the extension tubes. Exposure has to be adjusted manually.
Aperture control is not available if you use a lens which does not allow you to manually adjust the aperture (without an aperture ring).
Macro extension tube is wonderful substitution to expensive macro lenses. It maintains original optical while transform the lens into a macro lens. It is far more desired then the add-on close-up lenses, which will alter the optical quality. The extension tube will work with all Canon EOS cameras, digital or film.

Note: Camera not included.