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.
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 lenses given there is enough light to activate the
cameras AF system properly.
The KENKO DG AUTO EXTENSION TUBE SET contains three tubes of
different length, a 12mm, 20mm, and 36mm, which can be used individually
or in any combination to obtain the desired magnification.
PLEASE NOTE THE FOLLOWING:
Kenko Auto Extension Tubes are not auto focus compatible with Nikon
AF-s (Silent Wave) lenses, manual focusing is required with these
lenses. When using extension tubes the lens will not focus to infinity.
The focus range will be greatly limited to a very close focusing
distance. There is light fall off when using any extension tube,
sometimes the equivalent of 3 f-stops of light is lost when using
multiple extension tubes together. This light lost can affect the
camera's ability to auto focus. Manual focusing is recommended should
the lens begin to "hunt" (not lock onto the subject).
| Specifications |
12mm |
20mm |
36mm |
| Diaphragm coupling: |
Perfect coupling |
|
TTL.EE metering: |
Perfect coupling |
| Length of tubes: |
12mm |
20mm |
20mm |
| Diameter of tubes: |
62mm approx. |
| Weight: |
2.5 oz. (72g) |
2.9 oz. (84g) |
3.9 oz. (112g) |
| Mount Available for: |
Canon EF/EFS / Nikon-AF / Sony Alpha |
