Canon EF Extenders
Canon Extender EF 1.4x II
This
tele extender can be used with fixed focal length
lenses 135mm and longer (except the 135mm f/2.8 Soft
focus lens), and the EF 70-200 f/2.8L, 70-200 f/2.8L
IS, 70-200 f/4.0L, 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.
(When used with EF Extender EF 1.4x II, the
EF100-400mm f/4.5-5.6L IS USM lens is compatible for
auto exposure with all EOS cameras. However, you
lose autofocus with all EOS cameras except those
with a 45-point AF system, such as EOS-3, EOS-1v,
EOS-1D, EOS-1Ds and EOS-1D Mark II. Only the center
focusing point is functional when this lens/extender
combination is used with the 45-point AF cameras.
Also, when the EF100-400L is used with the EF 1.4x
II, the Image Stabilizer function does not work with
older EOS 35mm cameras such as the EOS 650, 620,
630/600, RT, 700, 750, 850, EOS-1, A2/A2E, 10s,
Elan, Rebel/Rebel S, and Rebel II/Rebel SII.)
| Specifications |
| Construction | 4 groups /5 elements |
| Maximum Magnification | 1.4x |
| Dimensions (Length x Diameter) | 2.9" x 1.1" / 72.8 x 27.2mm |
| Weight | 7.8 oz./ 220g |
Canon Extender EF 2x II
This extender has been re-designed optically and offers excellent performance with compatible EF lenses (same as the Extender EF 1.4x II). Features a new seven-element design, and same weather-resistant design and anti-reflection internal construction as the new EF 1.4x II. The EF 2x II doubles the focal length of any lens it's mounted to, and reduces its effective aperture by two stops. With the EF 2x II, AF is possible with any EOS body if the lens has an f/2.8 or faster maximum aperture, and compatible Image Stabilization lenses maintain the IS feature when used with any current EOS camera.
| Specifications |
| Construction | 5 groups /7 elements |
| Maximum Magnification | 2x |
| Dimensions (Length x Diameter) | 2.8" x 2.3" / 71.8 x 57.9mm |
| Weight | 9.3 oz. / 265g |