Canon 400mm 2.8L II w/ 2x III extender on 1DX. Aug 19, 2014. Just some samples in case someone else is looking for them (as I was before I made the purchase) since I realize the price point makes this an understandably rarer lens combination to find images of. I just got the 2x extender yesterday and took some pictures around the yard.

Specifically, Canon suggests that AF drive speed is reduced by 50% when using the 1.4x Extender, and speed is reduced by 75% when using the 2x Extender. Canon has indicated that autofocus speed

Canon E-77II Lens Cap. The EF 100-400mm f/4.5-5.6L IS II USM is a lightweight solution for photographers who can only travel with one telephoto lens. Ideal for professionals shooting sports and wildlife, with the 100-400 mm zoom range you can get up close to distant subjects without needing to disturb the scene, and the Zoom Touch Adjustment

MSRP Price: $429. Made in: Japan. Production Status: In Production. Lens Description: 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
Canon Extender EF 2x III. Canon. Extender EF 2x III. Ammattitasoinen polttovälin muuttaja, joka lisää L-sarjan objektiivien polttovälin kaksinkertaiseksi.
Introducing Canon's second generation of IS super-telephoto lenses: EF 300mm f/2.8L IS II USM, EF 400mm f/2.8L IS II USM, EF 500mm f/4L IS II USM and EF 600mm f/4L IS II USM Each Series III Extender features a newly developed microcomputer that increases AF precision when the extenders are used with an IS II super-telephoto lens. Far away closer: Canon Extender EF 1.4x III. The Canon Extender EF 1.4x III is one of the two Canon teleconverters. The other is the Extender EF 2x III. Both extend the focal length of any lens that can be used with the converters. The 1.4x does that with a factor of 1.4; the 2x, with a factor of 2. Ease of Use. In terms of its size and weight, the Canon EF 70-200mm F2.8L IS III USM is in the middle of the pack for an F2.8 70-200mm lens, measuring 20cms in length and weighing in at 1.48kg. It's about the same size as the Tamron SP 70-200mm F/2.8 Di VC USD G2 and noticeably lighter than the Sigma 70-200mm f/2.8 DG OS HSM Sports lenses.
Yes. 14 Jul 2012. #1. Maker/Provider: Canon. Product: Extender EF 2x III. Price: Around £400. Overall Rating: 8/10. Overall Summary: An effective way of doubling the focal length of a compatible lens, with the penalty of reducing the maximum aperture by 2 stops.
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    • canon extender ef 2x iii sample images