Refer to the camera and lens instruction booklets to see if there are any AF compatibility limitations. The maximum aperture is indicated in half-stop increments. Maximum Aperture with the Extender When Extender EF1.4X III is attached, the lens maximum aperture will be smaller (darker) by 1 stop.
You guys are awesome, thank you very much for your input. Waddizzle that's exactly what I needed to know👍🏻 " you're asking the wrong question "
Thanks for your advise. This lens was in the canon compatibility chart for the extender. Need to go for 1.4 x I guess.

With the 2X extender in place, even a 1DX III will not AF with using the normal AF system with that particular lens. With your 7D, AF won't work with the 1.4X either because the aperture rises beyond the f5.6 capability of the 7D as soon as you add an extender. Once your 100-400 is zoomed out to the f5.6 region, it is at the aperture limit of

This is straight from the manual. The TS-E 17mm F/4L IS NOT COMPATIBLE with any of Canon's teleconverters. All of their TS-E lenses are INCOMPATIBLE. -Demetrius. Current Gear: EOS 5D Mark IV, EF F/2.8 Trinity, EF 50mm F/1.8 STM, EF 85mm F/1.8 USM, 470EX-AI & 600EX II-RT. Retired Gear: EOS 40D. 1 Like.

Nothing you would be happy with. You would need a third party model like Kenko. You would lose autofocus capability. That zoom isn’t the best image quality to begin with; the extender will degrade it more. John Hoffman. Conway, NH. 1D X Mark III, Many lenses, Pixma PRO-100, Pixma TR8620a, LR Classic.

bC7v9.
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    • canon extender ef 1.4 x iii lens compatibility