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Canon RF 2x work with EF-RF adaptor

PurpleAnts
Apprentice

Hi, I try to play some telegragh with a 70-210 ES lens on EOS R. I am currently using a EF-RF adaptor to mount the EF lens to EOS R. Can I add a RF 2x mount between the R5 and EF-RF adaptor and make the lens to 400mm? Thank you.

3 ACCEPTED SOLUTIONS

p4pictures
Whiz
Whiz

Unfortunately this nice idea doesn’t work. Physically the inside dimensions of the EF to EOS R mount adapter do not allow the protruding front part of either the RF 2x or the RF 1.4x to fit inside. I have tried this myself last year so I know it to be true. 


Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --

View solution in original post

kvbarkley
VIP
VIP

Ken Rockwell did it with an R and EF100-400 with the 1.4 *and* 2.0 converter!

D3S_4047-with-teleconverters.jpg

https://kenrockwell.com/canon/eos-r/r.htm

View solution in original post

I often use the EF 70-200mm f/2.8L IS II USM with an Extender EF 1.4x III on the EF to EOS R mount adapter with my EOS R cameras and also with the EF 100-400mm f/4.5-5.6L IS II USM. 

When I had the 1.4x and 2x RF extenders last year I thought that mounting the EF EOS R adapter on them would allow the extender to be used with all kinds of EF lenses, but it was obvious that they physically don't fit.


Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --

View solution in original post

6 REPLIES 6

p4pictures
Whiz
Whiz

Unfortunately this nice idea doesn’t work. Physically the inside dimensions of the EF to EOS R mount adapter do not allow the protruding front part of either the RF 2x or the RF 1.4x to fit inside. I have tried this myself last year so I know it to be true. 


Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --

Just found these pictures I took from when I tried to make this work.

This is Extender RF 1.4x and the EF to EOS R control ring mount adapter, though it is also the same for the plain adapter without control ring.

2108BWR67208_1726-IG.jpg2108BWR67200_1718-IG.jpg


Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --

ebiggs1
Legend
Legend

"Can I add a RF 2x mount between the R5 and EF-RF adaptor ..."

Whether that will work or not I don't know since I have never tried it. However, if it doesn't fit you could try one of the off brand tel-cons from Kenko, Tamron or Sigma. Personally I am not a fan of any tel-con but that said I have about a dozen of them. I know, I know its just curiosity but it has confirmed my basic dislike for a tel-con.

There are a few, very few, lenses where the combo does work well together, IMHO. The ef 70-200mm f2.8 lens is one of them but with the 1.4x model and not the 2x. As a matter of fact I don't consider the 2x to be of any use on any lens. I have used the Sigma 1.4x on my Sigma 150-600mm S lens and it works fairly well as it does on my 120-300mm Sigma f2.8 lens.

The Kenko seems to be as good as an off brand generic tel-con can be. No where as good as the Canon model or even as good as Tamron or Sigma but it m ay do what you want.

EB
EOS 1DX and 1D Mk IV and less lenses then before!

kvbarkley
VIP
VIP

Ken Rockwell did it with an R and EF100-400 with the 1.4 *and* 2.0 converter!

D3S_4047-with-teleconverters.jpg

https://kenrockwell.com/canon/eos-r/r.htm

I often use the EF 70-200mm f/2.8L IS II USM with an Extender EF 1.4x III on the EF to EOS R mount adapter with my EOS R cameras and also with the EF 100-400mm f/4.5-5.6L IS II USM. 

When I had the 1.4x and 2x RF extenders last year I thought that mounting the EF EOS R adapter on them would allow the extender to be used with all kinds of EF lenses, but it was obvious that they physically don't fit.


Brian
EOS specialist trainer, photographer and author
-- Note: my spell checker is set for EN-GB, not EN-US --

PurpleAnts
Apprentice

Thank you guys. Seems EF lens + EF extender + RF converter works while EF lens + RF coverter + RF extender doen't. I will pursue the fist path and give it a try.

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