Fotodiox Automatic Macro Extension Tube for Canon EOS (EF, EF-S) Mount SLR Cameras for Extreme Close-up Photography

Product Highlights:

The Fotodiox Macro Extension Tube is a wonderful substitution for the expensive macro lens. They are exceptionally useful for macro photography, enabling you to convert almost any lens into a macro lens at a fraction of the cost while maintaining its original optical quality. By placing distance between your camera body and lens, focusing distance is shortened and the magnifying effect of your subject is created.

Fotodiox Pro Auto Macro Extension Tube Kit for Canon EOS is a set of automatic tubes that are able to communicate all electronic functions from the lens to camera including autofocus and auto-exposure. Available individually or as a set which contains all three extension tubes of 13mm, 21mm, and 31mm in length. The extension tubes can be used independently or added together for extreme macro photography. No other optical components are added with this kit, so the image will preserve the original optical properties of the lens.

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Extension Tubes Overview ¹

An extension tube is simply a hollow cylinder that fits in between your camera and lens, causing the lens to move farther from the sensor. This additional distance allows your lens to focus more closely, which in turn provides more magnification capability. Unlike most lens accessories, extension tubes don't add any extra optics, and are therefore relatively inexpensive, simple devices.

Choose a Magnification:	1:2 (0.5X)	1:1 (1.0X)
Note: Diagram assumes that the lens is symmetric (pupil magnification = 1)

An extension tube increases lens magnification by an amount equal to the extension distance divided by the lens focal length. For example, adding a 25 mm extension tube to a 50 mm lens will give a magnification gain of 0.5X. Therefore, if the lens's original magnification was 0.15X, then the new magnification will be 0.15X+0.5X=0.65X. The closest focusing distance will also decrease to ~210 mm.

0.15X Max Magnification with typical 50 mm lens	0.65X Max Magnification after 25 mm extension tube
Note: Shown using a full frame camera and a Canon EF 50 mm f/1.4 lens

All camera lenses have some amount of native extension, which is used to focus on everyday objects. Lenses with closer focusing distances usually have more native extension, but these will also benefit less from extension tubes. Try experimenting with different lenses to see how extension affects magnification.

For More information on Macro Extension Tube usage and calculations, please check the links below:

All pictures are for illustration purposes only. Actual product may vary slightly due to ongoing improvements in design.