So, I recently bought a new Canon R6 and am delighted with it. Only very slight downside is the reduced focal length having changed to full frame from cropped sensor, so considering a new 300mm f2.8 lens, but would like to know if anyone would have experience of using a x2 extender as i could use this along with my very sharp 70-200f2.8 lens? It would mean less gear to lug about, be much lighter, less expensive and also offer a longer focal length. Any thoughts would be greatly appreciated....