whitehall Loc: Canada

I have the R 5 and the 24-70 and 70-200 R lenses both 2.8. As I still have my 5D mk iv as a backup I have not sold my EF lenses. I used the 100-400 mkii and the 24-105 on the R 5 with an adapter with control ring. The EF lenses work just fine, but although I have not done a rigorous scientific study I generally find the R lenses to be sharper ( focal length and f stops the same based on Lightroom info)

wcmoorejr Loc: Birmingham Alabama

The tamron 16-300 and 18-270 do not work with the R7. It will mount and track the subject but when you press the shutter, it will lock up. You have to remove the battery and put it back in to get the camera to respond again. I talked to tamron support on the 18-400 lens. They are working on a firmware update on it to make it fully compatible with the R7. right now it is hit or miss.

The canon 17-40, 24-70, 70-200 all work great.

PhotosBySteve

All of my EF lenses work with my EOS-R flawlessly. They actually work better in some ways with the R.

philo Loc: philo, ca

I have an R and R6 and all of my ef lens work just fine. Also a couple of my third party lens didn't work and I connected the maker and they added up to date film wear and they all work great.

Architect1776 Loc: In my mind

Try it.
I thought I wouldn't but having used it I am so glad I have it

Architect1776 Loc: In my mind

MtManMD Loc: Beaverton, Oregon

The Tamron 150-600mm G2 lens I had would not work with my R5. The focus was off considerably. I couldn't resolve and passed on the option to send lens and my new R5 together to Tamron support. Sold the lens and now am a happy owner of the Canon RF 100-500mm. I have not had any issue using my Canon EF lenses with the adapter.

Bottom line, you won't know for sure that the non-Canon lenses will work until you try them. As commented already, some with the same Tamron lens report theirs worked okay.

MtManMD Loc: Beaverton, Oregon

The Control Ring works great for exposure compensation. I use it shooting with Manual + Auto ISO and it overrides the ISO change. Give it a try. I used it quite a bit recently at Bosque with my 100-500mm for birds against a light background. My one complaint is that out of my 4 RF lenses, there are three variations of where/what the Control Ring is, so sometimes I have to stop and teach my hand where find it.

Architect1776 Loc: In my mind

I agree with the failure to have the rings in the same location .
It would be best for me in the old Canon FD aperture location next to the body.
Like the control ring is.

Red6

This was a very timely and informative subject thread. I just made the decision to switch from my Sony A6400 to a Canon mirrorless. Undecided at this time on which Canon model, but my primary reason for switching is to take advantage of the vast number of EF and EF-S lenses by using the R adapter with the Canon model I choose.

Sony is expanding their line of lenses, but as my interests change, I like to experiment and learn about different lenses. That is becoming expensive with Sony lenses. From my observations, it appears that the number of good-quality used Canon lenses is very large.

I am just now acquainting myself with the Canon world. Is this a correct assumption?

Blurryeyed Loc: NC Mountains.

It's not necessary to go out and purchase a bunch of RF lenses, your EF lenses will work just fine on the R mount with adapter. I have been shooting the R5 for a couple of years now and only have the RF 24-105 that came with the original R that I purchased before the R5, the rest of my lenses are EF and I am in no rush to buy new lenses. The image below was shot with an EF 16-35.

(Download)

Architect1776 Loc: In my mind

It is correct.
There are 35 years of EOS lenses and many are unique and interesting.
Additionally you might consider the vast number of Canon FD mount lenses that are amazing if you want to manually focus. Some auto modes even work with them. You will need a FD-RF adapter.

rehess Loc: South Bend, Indiana, USA

Canon is now reaping the result of their making the switch to the EF-mount in one step. Yes, they made a bunch of lenses unusable by new cameras; Nikon and Pentax maintained some form of compatibility, but Nikon is now paying the cost of some users not understanding and Pentax has dropped support of new lenses by older cameras.

LFingar Loc: Claverack, NY

I think you will be happy and with the number of Canon lenses that have been produced you should have no problem finding good used ones. I would stick with retailers like Adorama, B&H, KEH, etc. Their prices are fair and their condition ratings are, if anything conservative. Definitely go with the Canon EF/RF adapter. Aftermarket adapters are of varying quality. Some work great but there have been claims of some producing a loose fit.
Most Canon lenses are very good. Many are excellent. A few are untouchable. There are a few clunkers though so pay attention to reviews. If you are not familiar with designations then "L" is the premium line. Very hard to find an inferior lens there. IS is Image Stabilized. The lens has internal stabilization which will work in conjunction with the in-body stabilization that some of the R series cameras have.
My nephew is in the process of switching to Canon mirrorless. He was a newspaper photographer in the '90's but about 20yrs ago he started a hardwood floor contracting company and photography became a sideline. He was a 100% dedicated Nikon guy. According to him Nikon DSLRs are the cameras of the Gods! Decided to try mirrorless this past summer. Bought a Nikon Z9. Liked it. Then, surprise surprise! He decided to try Canon. Bought an R3 and RF 70-200 f/2.8 L. At first all he would admit to was being quite impressed.That was 6 weeks ago. Last week he mentioned that his 2nd R3 had just arrived, along with a second lens and that he is in the process of selling his Nikon gear. Already got his next lens picked out: an RF 400 f/2.8 L. I would have taken any bet that he would never leave Nikon, especially for Canon, but, apparently pigs have started flying!

CHG_CANON Loc: the Windy City

The only Canon drawback is their decision to limit which models are IBIS-enabled. Doesn't matter much with IS-enabled EF / EF-S lenses. But, if you drop further back into the older EF line-up, the modern IBIS support of the non-IS lenses is missing with the wrong EOS mirrorless body.