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Extension tubes are designed to enable a lens to focus closer than its
normal set minimum focusing distance. Getting closer has the effect of
magnifying your subject (making it appear larger in the viewfinder and
in your pictures). 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.
The DG extension tubes have no optics. They are mounted in between the
camera body and lens to create more distance between the lens and film
plane. By moving the lens father away from the film or CCD sensor in
the camera, the lens is forced to focus much closer than normal. The
greater the length of the extension tube, the closer the lens can
focus.
The KENKO DG AUTO EXTENSION TUBE SET contains three tubes of different
length, a 12 mm, 20 mm, and 36 mm, which can be used individually or in
any combination to obtain the desired magnification. Kenko also makes a
DG UNITUBE 12 mm or 25 mm which can be purchased individually.
Kenko's Auto Focus extension tubes are designed with all the circuitry
and mechanical coupling to maintain auto focus and TTL auto exposure
with most Canon, Nikon, and Minolta lenses given there is enough light
to activate the cameras AF system properly.
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