The-Digital-Picture hacks EF-RF adapter to make *all* EF lenses work with RF teleconverters

H. Jones

Aug 1, 2014
This is really, really interesting:

Turns out that with a little physical modification, you *can* use the RF teleconverter with an EF-RF adapter to increase the focal length of all EF lenses.

It's unfortunate that there had to be a drill involved to do this, but I'm sure a third party will release a different adapter soon that accepts teleconverters with this knowledge out there. This is super cool, I may buy one of the off-brand adapters, and put a drill to work to try this out.

Fun that the 24-70 turns into a 34-100mm F/4, wonder what other useful combinations there are? I think this would mostly be useful to add another 1.4 extender to any EF lenses you'd want, I'd like to see the RF 1.4 combined with the EF 1.4x for some easy extra reach.
  • Like
Reactions: thelebaron


I'm New Here
May 13, 2019
R5 -> RF 2.0x TC -> RF to EF adapter -> EF 2.0x -> EF 800mm f/5.6L :LOL:

someone make this happen and let me know if it autofocuses!
  • Like
Reactions: kesnfs


EOS 5D Mark IV
CR Pro
Oct 18, 2011
So this would let me use a 70-300L with a 1.4 or 2.0 converter! :love:
I would love to see what the IQ was like with that combo
  • Like
Reactions: pj1974

Mt Spokane Photography

I post too Much on Here!!
CR Pro
Mar 25, 2011
It probably still would not let me use my 100L with a TC. They seem to be incompatible and go crazy if you can find one that fits.
<-- start Taboola -->