The RF 70-200 f2.8 or f4 is not compatible with the 1.4 or 2.0x extenders. Your current choices would be: RF 100-300mm f/2.8 L IS USM - TC's can be used with full focal length 100-300. RF100-400mm F5.6-8 IS USM - TC's can be used with full focal length 100-400. RF100-500mm F4.5-7.1 L IS USM - TC's can be used 300-500mm only. RF400mm F2.8 L IS USM.

In reply to BG454 • Mar 13, 2014. MisterBG wrote: I'm considering a 1.4x teleconvertor and I was looking for opinions and comments on the Canon EF 1.4 MkIII against the Kenko 300 DGX. Most use will be for wildlife, including BIF, and principally with the 70-200 F4L and 100-400 F4.5-F5.6L lenses on my 6D body.

The following EF lenses support autofocus, chromatic aberration correction, and peripheral illumination correction. EF16-35mm f/2.8L II USM (80%) EF16-35mm f/2.8L III USM (80%) Physical differences. Since the introduction of the 800mm f5.6, Canon changed their off-white color of their telephoto lenses. All the new MKII IS super-tele lenses from Canon feature this new coloring so the MKIII extenders have been updated to match both the color and also the very slightly smoother design aesthetic of these lenses.
Applicable when subject frame is shown while using +Tracking and RF lenses (except RF600mm F11 IS STM / RF800mm F11 IS STM and Extender RF), EF lenses (excluding some current products), EXTENDER EF (III) (depends on master lens AF area mode). Some scenes and subjects may not be applicable.

From what I've seen and read, this lens is really just a 150-400mm lens. 400 and beyond is soft and the Canon 400mm 5.6 upsized to 600 and even 700mm is sharper at the Tamron's native 600mm setting! For me personally I'd get the Canon 400mm. And I plan to eventually.

ZneeoJc.
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    • canon extender ef 1.4 x ii lens compatibility