I was too lazy to find it in the Canon material, but this is from the RF 1.4x TC product page on B&H. Lens compatibility in the description: RF 100-500mm f/4.5-7.1L IS USM (can only be used within 300-500mm range) RF 600mm f/11 IS STM; RF 800mm f/11 IS STM The Canon EF 1.4x II Extender is an easy and very affordable way to noticeably extend the reach (focal length) of compatible Canon L Series lenses (and a few additional lenses). The Canon EF 1.4x II Extender mounts between the compatible lens and body, and multiplies the focal length settings of your lens by 1.4x. A good 1.4x teleconverter, when used with a Canon L 300mm f/2.8 or 300mm f/4, can outperform a good (but not great) 400mm telephoto such as the Sigma APO (not the APO macro version) lens. The 300 + 1.4 TC combination also roughly equals the performance of a 400mm Canon L f/5.6 lens. FF is of course more expensive, but the price differential I wouldn't do it. It's already a slow lens and the tele-con will only make it slower f9 to f14 in the case of the 2x. Very slow starting apertures! Since I wouldn't do it, I don't know if they work or not personally. Canon tel-cons do not work on all Canon lenses. Make sure the Rf 100-500 is listed Canon E-72II Lens Cap. $13.50. $15.00. Buy Canon Extender EF 1.4X III features EF Mount Teleconverter, 1.4x Magnification Factor, Microcomputer Controlled, Communication Between Lens & Camera, Spectra Coating Reduces Ghosting/ Flare, Protective Fluorine Coating, Dust and Water Resistant, C. Model Overview. Built with distance in mind, the Canon EF 1.4x II Extender offers extra zoom for that all important moment. As an added extra to the lens, it provides excellent focal range without comprising quality. It offers a perfect lightweight option to mulitiply the focal length without investing in a new lens. Canon lens extenders were designed in the era of film, making them fully compatible with full-frame, APS-H and APS-C EOS digital cameras. The trade-off to the 40% extended range of the extender is Rol Lei Nut wrote: Ended up getting the Kenko Teleplus Pro 300 AF DGX 1.4x. On a Sony A7Rii body, MC-11 adapter and Canon 70-200 4.0 IS L, 70-300 L, 100-400 II L & 100 2.8 Macro USM, AF works well (or at least as well as the lenses do without an extender). Not used extensively yet, so plenty of time for any glitches to come out. YSNz9U.

canon extender ef 1.4 x ii compatibility