I was stunned to learn that not only did the Kenko 1.4X Teleplus Pro 300 (teleconverter) for Canon autofocus with the 800 and the 1DX (it does not work with the 5D III and the 800), but that I had access to all the AF sensors and all of the AF Area Selection modes. And best of all AF was fast, responsive, and accurate. And the images and image quality were all excellent by my standards. See and read the whole story here. The blog post includes lots on the phenomenal 1DX.
Preening adult Semipalmated Plover: Canon 800mm f/5.6L IS lens with the Kenko 1.4X Teleplus Pro 300 (teleconverter) and the EOS-1DX.
Do note that the metering is screwed up; everything is one stop too light. This is a very small price to pay for superb AF at 1120mm.
ISO 800: 1/1000 sec. at f/9.
Don't be shy: all honest comments are welcome.
ps: Though I am the guy who writes, says, and teaches: 99.9% of successful images of preening birds have the bird's face parallel to the imaging sensor and a good view of the eye the unique pose and the feather in the bill puts this one well into the .01% for me. Image made possible by the 12 fps frame rate.
ps: almost fogot--the Kenko 1.4X works (of course) with the MIV and the 800 but get this: you get all focus points. Pretty amazing if you ask me.







. Image made possible by the 12 fps frame rate.
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