Canon Extender EF 1.4X III

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Canon Extender EF 1.4X III

From the manufacturer

Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates phenomenal optical performance with minimal chromatic aberration and is a perfect complement to many of Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens and extender; features careful lens placement and coatings to minimize ghosting and flare and even has a new Fluorine coating that keeps soiling, smears and fingerprints to a minimum. An integral part of many professional systems, Extender EF 1.4X III maintains high standards not only optically, but also in terms of rugged, dustproof and water resistant construction.

url to full description on Manufacturer's web site.
From Wikipedia

The extenders are constructed with metal bayonets, and engineered plastic ends. There are no moving parts, other than the lens latch lock. Three generations of the extenders exist: the older 1.4× and 2×, the 1.4× II and 2× II, and the 1.4× III and 2.0× III. The II versions have weather-sealing and anti-reflective surfaces inside the extender body. The optical construction of the 1.4× versions are a of five-element design. Both 2× versions use seven elements, although the optical formula of the II version is different, to improve optical performance.[3] The III versions of the extenders have improved autofocus performance as well increased image quality over the II, and their front and rear elements are coated with fluorine anti-smear coating to be easier to clean.[4]

url to full article on Wikipedia.
MSRP 499 US$ Aperture (large) f/
Announced Magnification x
Length 28mm Minimum focusing distance m
Weight 225gr Focal mm
Filter diameter mm Diaphragm blades
Manufacturer Canon Color White
Mount Type Canon EF Category Specialty
Published reviews
Review HA SA VI ME
SLRGear [fontawesome icon="fa-square-o" circle="no" size="medium" iconcolor="#ed1c24" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""][fontawesome icon="fa-square-o" circle="no" size="medium" iconcolor="#ed1c24" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""][fontawesome icon="fa-square-o" circle="no" size="medium" iconcolor="#ed1c24" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""][fontawesome icon="fa-check-square-o" circle="no" size="medium" iconcolor="#6fdc64" circlecolor="" circlebordercolor="" flip="" rotate="" spin="no" animation_type="0" animation_direction="down" animation_speed="0.1" alignment="center" class="" id=""]
HAnds-on, SAmple images, VIdeo, MEasurements.
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Lens features
WE CI FU ST FT CO
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WEathersealing, CIrcular aperture, FUll time manual focus, STabilization, FT:Filter threads, COnstant minimum aperture,
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2015-03-15T06:31:41+00:00