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.
1. The Canon extenders (Canon does not make "teleconverters") almost always work with third party telephoto lenses in the EF mount that are compatible with their own maker's TCs.¹ Such telephoto lenses tend to have enough clearance in the back of the lens for the Canon extender to fit.

I don't have an EF 500mm f/4 mk II lens on hand but there have been improvements to the results from the EF 1.4x III Extender. It is claimed that the microprocessor in the EF 1.4x III Extender promises faster AF speed and increased AF precision on the Canon EF 500mm f/4L IS II USM Lens. So yes, you should see an improvement with this lens.

Options. 08-06-2023 06:36 AM. From Canon's product page for the RF 1.4X extender: Note: This extender is only compatible with the following RF lenses RF100-400mm F5.6-8 IS USM, RF100-500mm F4.5-7.1 L IS USM, RF400mm F2.8 L IS USM, RF600mm F4 L IS USM, RF600mm F11 IS STM, RF800 F5.6 L IS USM, RF800mm F11 IS STM, RF1200mm F8 L IS USM. 72.0 x 27.2. Weight (g) 225. Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates phenomenal optical performance with minimal chromatic aberration and is a perfect complement to many of Canon super telephoto lenses. It features a built-in microcomputer for seamless communication among camera body, lens and
The new mount converter enhancing the extensibility of the L-Mount system. The SIGMA MOUNT CONVERTER MC-21 allows SIGMA SA mount and SIGMA’s CANON EF mount interchangeable lens owners to use their lens investment on L-Mount camera bodies. The converter allows more freedom of choice for L-Mount cameras, enhancing the extensibility of the L
1-770-333-4200. Description. The Canon 1.4X EF Extender III is a professional grade teleconverter designed exclusively for use with select Canon brand L-Series lenses (focal lengths over 135mm). Extending a lenses focal length by a factor of 1.4x, Extender EF 1.4X III incorporates incorporates careful lens placement and state of the art
Adding a tele extender does not change the focal length of that lens. The thing that does change is the angle of acceptance. The focal point of that lens does not change and can not change. Also any time you increase the length of the lens tube, you will sacrifice some f-stop value. Adding the 1.4x to your 400mm lens dose not turn it into a
So the Canon 1.4x EF Extender would make a 200mm focal length more like 280mm. While there can be some image degradation, this does allow for a relatively cheap way to achieve the magnification found in longer focal lengths. An extender is also lighter and smaller than a lens, coming in at only 2.9″ x 1.1″, 7.8 oz. (72.8 x 27.2mm, 220g).
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.
I have been using the 1.4x extender with various models of the 70-200 f/2.8 along with other telephotos for 25 years. I love the 1.4x and hate the 2x. I have seen almost negligible change to an image with the 1.4x on an L lens and no difference in autofocus speed.
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    • canon extender ef 1.4 x ii lens compatibility