Canon Extender EF 2x III

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Canon Extender EF 2x III

From the manufacturer

Designed to extend a lenses focal length by a factor of 2x, the redesigned Canon Extender EF 2X III delivers optical performance on par with the finest 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, flare and chromatic aberration, and even has a new Fluorine coating that keeps soiling, smears, fingerprints to a minimum. Extender EF 2X III meets necessary standards in terms of rugged, dustproof and water-resistant construction, and should be in every professional's camera bag.

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 449 US$ Aperture (large) f/
Announced Magnification x
Length 53mm Minimum focusing distance m
Weight 325gr Focal mm
Filter diameter mm Diaphragm blades
Manufacturer Canon Color White
Mount Type Canon EF Category Specialty
Published reviews
Review HA SA VI ME
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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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2015-03-15T06:34:16+00:00