Well now someone else is insisting that the 1.4x TC III + 70-300L + 1DX doesn't report f/8 or AF well so maybe I got bogus info at first. Maybe there is no way to make that combo report f/8. A huge shame, but what can you do, sounds like you can't blame the firmware after all.
(Although they could add a custom function called force f/8 AF mode hint hint
). Not that I expect that to happen. Usually companies with more than 4 employees don't do that sort of stuff. But it would be awesome (and boost Canon TC sales vs Kenko hint hint
I guess I'll order the Kenko (apparently it has a chip inside that can spoof things or something and tricks it into reporting f/8 even though the 70-300L doesn't have TC pins) and hope the image quality it provides is enough to make it worthwhile.
To bad the Canon TC III didn't have some fancier logic in it to spoof things when needed or a force f/8 mode custom function is unlikely.
Anyway guess they didn't remove stuff from the f/8 addition so it's all good on their part. Glad we have f/8 ability for what it does handle
Unless I hear otherwise yet again.