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New Contributor
Posts: 2
Registered: ‎05-20-2021

EF Teleconverters on R mount cameras-restrictions?

[ Edited ]

Hi-I anticipate buying an R mount Canon in the near future and I'm trying to decide whether I also want to trade in my

EF 100-400 L (first generation).  My question is this:

 

If I use a Canon 1.4 or 2.0 EF teleconverter with the EF 100-400, on an R mount camera (with adapter of course), what restrictions to auto focus or other functions might I encounter?  Would those same restrictions also apply to an RF 100-500 with an RF teleconverter?

 

I mainly ask because, despite the great reviews for the RF 100-500, it also costs a big chunk of change. If I could retain reasonable functionality with my EF 100-400 with EF teleconverter, that would help.  On the other hand, if that combo would prohibit some of the cool functionality that an R6 (for instance) offers (like eye focus, etc.), I might spring for the RF 100-500.

 

Thanks for any feedback. 

Super Contributor
Posts: 198
Registered: ‎09-01-2014

Re: EF Teleconverters on R mount cameras-restrictions?

I use the 100-400L II with an EF 1.4x on our R6 with no issues. I bought the ring adapter, and it seems to function properly, although I haven't programed it extensively. I haven't used the RF 100-500, but I don't see why there would be any limitations other than those you normally encounter with any extender, like loss of periferal focus points, which I haven't noticed with the EF 100-400L II w/converter and adapter on the R6. But I miss stuff sometimes Smiley Wink

VIP
Posts: 11,698
Registered: ‎08-13-2015

Re: EF Teleconverters on R mount cameras-restrictions?

What I want to know is whether or not an RF teleconverter works with the EF-RF mount adapter.  I want to buy a 2x, but don't want to spend money on one for EF mount.

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"Doctor told me to get out and walk, so I bought a Canon."
Esteemed Contributor
Posts: 4,729
Registered: ‎02-17-2016

Re: EF Teleconverters on R mount cameras-restrictions?

I don't see how it can. The adapter has to go right next to the camera, leaving the EF side facing the outside world.

New Contributor
Posts: 2
Registered: ‎05-20-2021

Re: EF Teleconverters on R mount cameras-restrictions?

Thanks!

VIP
Posts: 11,698
Registered: ‎08-13-2015

Re: EF Teleconverters on R mount cameras-restrictions?

[ Edited ]

@kvbarkley wrote:

I don't see how it can. The adapter has to go right next to the camera, leaving the EF side facing the outside world.


Rightt, and the EF lens would go on the adapter.  

 

[ EOS R5 ] + [ RF 2x ] + [ RF-EF Adapter ] + [ EF mount telephoto lens ]

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"Doctor told me to get out and walk, so I bought a Canon."
VIP
Posts: 13,998
Registered: ‎12-07-2012

Re: EF Teleconverters on R mount cameras-restrictions?

I don't see why it would not work or at least mount. The IQ may be the deciding factor. Personally I wouldn't do it since I don't like adapters or 2x tel-cons.

EB
EOS 1DX and 1D Mk IV and several lenses!
VIP
Posts: 11,698
Registered: ‎08-13-2015

Re: EF Teleconverters on R mount cameras-restrictions?


@ebiggs1 wrote:

I don't see why it would not work or at least mount. The IQ may be the deciding factor. Personally I wouldn't do it since I don't like adapters or 2x tel-cons.


Just as the EF 1.4x III and EF 2x III teleconverters were a significant step up over their predecessors in IQ, so are the RF teleconverters a significant  step up in image quality over their EF predecessors.  

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"Doctor told me to get out and walk, so I bought a Canon."
Respected Contributor
Posts: 1,436
Registered: ‎01-25-2018

Re: EF Teleconverters on R mount cameras-restrictions?

I agree with Ernie about the 2X, I have one but it drops the IQ too much to be usable.

 

The 1.4X works well on better glass, I have a 200 f2, 300 and 400 f2.8, and 800 f5.6 and all of these play well with the 1.4X and produce very nice results; the first three primes are examples of Canon at the top of their game and the 800 is very good but not quite up to the stunning sharpness and clarity of its smaller brothers.  The 2X results aren't horrible UNTIL you compare the detail, contrast, and color to the bare lens results; it effectively turns some of Canon's best glass into also ran status.

 

Rodger

EOS 1DX M3, 1DX M2, 1DX, 5DS R, 1D M2, EOS 650 (film), many lenses, XF400 video
VIP
Posts: 11,698
Registered: ‎08-13-2015

Re: EF Teleconverters on R mount cameras-restrictions?


@wq9nsc wrote:

I agree with Ernie about the 2X, I have one but it drops the IQ too much to be usable.

 

The 1.4X works well on better glass, I have a 200 f2, 300 and 400 f2.8, and 800 f5.6 and all of these play well with the 1.4X and produce very nice results; the first three primes are examples of Canon at the top of their game and the 800 is very good but not quite up to the stunning sharpness and clarity of its smaller brothers.  The 2X results aren't horrible UNTIL you compare the detail, contrast, and color to the bare lens results; it effectively turns some of Canon's best glass into also ran status.

 

Rodger


I agree with Ernie, too.  He's talking about EF Teleconvertes.   The RF Teleconverters seem to have MUCH improved optics over their EF Mark III predecessors.  Like I said, the Mark III models were a major step up, and it seems the RF models are, too.

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"Doctor told me to get out and walk, so I bought a Canon."
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