Which extender for my EOS R5 Mark II and EF 100-400mm f/4.5-5.6L IS II USM?

[Chickadee12]

I want to get a 1.4x extender to give me a little more reach.  (I know others that do this and it works well with very little difference in quality.  I think the 2x extender might limit me too much in lower light situations.)  I of course use the R to EF adapter.  Should I get the R 1.4x or the EF 1.4x III extender.  I have read that most use the EF,  but in the future I may change to a R lens (depending on what Canon comes out with) so wonder if I put the extender next to the body and the adapter next to the lens will that work? 

Anne

[ebiggs1]

" I almost fell of my chair when I saw what Lightroom restored,..."

Absolutely. People that don't use or don't care to learn how to use LR have no idea how good it is and how important it is to great images. Great photos are made in post not in the camera and is becoming even more a factor.