• Extension tubes are designed to enable focusing closer than the normal minimum distance
• Designed with all the electrical and mechanical couplings to maintain auto focus and exposure
• No optical insert - maintains lens optical quality while remaining lightweight
• Any combination of tubes can be used for various reproduction ratios
• Limited 2-Year Manufacturer Warranty
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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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:
|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.
• Extension tubes work best with short to medium focal lengths, they are less effective with telephoto lenses
• Extra magnification also magnifies camera shake as well as the subject, tripod use is recommended
• Be sure to use the smallest aperture (largest number) on your lens to give you adequate depth-of-field for better quality images
• Each ring brings you closer to the subject as you increase the distance between lens and camera
• Different lens lengths will require a different distance to be used from the subject, if the subject is not in focus move the camera closer or further from the subject until the subject comes into focus
• The effectiveness of extension tubes decreases as focal length increases. You will need to be careful when working with extreme wide-angle lenses as the focusing distance required may be closer to the lens than physically possible (ie you'd hit the front lens element before you achieve focus).
For More information on Macro Extension Tube usage and calculations, please check the links below:
• ¹ Macro Extension Tubes & Close-Up Lenses - Cambridge In Colour
• The Ultimate Guide to Extension Tubes - Shutter Muse
All pictures are for illustration purposes only. Actual product may vary slightly due to ongoing improvements in design.