The "upgraded internal processor" of the 1.4x III is only compatible with Mk II SUPER Telephoto lenses. The Canon EF 100-400 Mk II is not one of the Mk II SUPER Telephoto lenses that is compatible. Therefore you will not see an increase in focus speed over the 1.4x II.
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CANON Extender EF 1.4x II and Extender EF 2x II Teleconverter compatibility Chart * In the charts "xxD, 5D, 7D represents all Canon "non 1 series" cameras film or digital re AF compatibility. This includes Rebel series, xxD, D60, 10D-50D, 7D 5D etc. "1D" is representative of all "1 series" film or digital as well as the EOS 3.
A Welland wrote: Does anyone know if the Canon EF 28-300mm f/3.5-5-6 L IS USM lens is compatible with the new 1.4X II extender/teleconverter? No. The only Canon zooms that can mate with the Canon EF 1.4x II and 2x II are the four 70-200Ls, and the 100-400L.
Canon EOS R, 1.6x APS-C crop, EF Control Ring Adapter, Extender EF 1.4x II, Extender EF 2x II and Sigma 60-600mm set to 600mm, giving an effective 1,680mm focal length, 1/30 at ISO 1,600 at full aperture. bigger. Used with teleconvertters the combination can be so long that I can photograph local airplanes in the sky and read their tail numbers. Canon's EF Extenders . Similary to the 1.4x series, there isn't an appreciable difference between the version II and III 2x Extender, at least as sharpness is concerned. Using a 2x Extender EXTENDER EF2× II. エクステンダーとは、カメラボディと撮影レンズの間に装着して焦点距離を延長するためのアダプターレンズである。. 装着レンズの高い光学性能を維持しながら“エクステンダーEF1.4×II”は1.4倍に、また“エクステンダーEF2×II”は2倍に j5UxiFI.
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