Regis wrote:
You can only stack Canon 1.4x II, 2x II together and not the Canon 1.4x III, 2x III. Plus stacking will only work with mirror-less cameras. Auto-focus is possible with the stacking, but it is slow to focus but accurate and sharp. This new Canon EOS R camera is my back-up and not my main camera Canon 5Dsr.
Thank you, Regis. No mirrowless as of now so you saved me.