Canon Extender EF 1.4x II

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Canon Extender EF 1.4x II

From the manufacturer

This tele extender can be used with fixed focal length lenses 135mm and longer (except the 135mm f/2.8 Softfocus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L IS, 70-200 f/4.0L, 70-200 f/4.0L IS USM, and 100-400 f/4.5-5.6L IS zoom lenses. Superb optically, it preserves the image quality of the lens it's mounted to and multiplies its focal length 1.4x. Effective aperture is reduced by one f-stop; autofocus is possible on any EOS camera when combined with a lens having an f/4 or faster maximum aperture. The new version II maintains the outstanding optics of the previous version, and adds enhanced weather-resistant construction, and improved anti-reflective surfaces in the barrel.

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 US$ Aperture (large) f/
Announced Magnification x
Length 28mm Minimum focusing distance m
Weight 200gr 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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2015-03-15T06:30:18+00:00