C/Y and EF lenses work for me. I'm glad RF lenses are making EF lenses less expensive. I might actually get a 70-200 IS 2.8 for under $1k.

Views are ticking along nicely on this one, really good topic, should get good views over the long term.

the EF mount has so many great options and as an EF user, my glass will follow me if I leave it.

- EF lenses can be adapted to Nikon Z mount too and adapters works very well. - There are speed boosters (focal reducers) for other mounts too, like Sony, Nikon, M4/3 and Fuji. The Fuji ones are interesting, because FX mount is crop sensor only, so you can use a near full frame focal range with EF lenses. I'm sticking with Canon EF mount because i can't decide wich mirrorless system to get (I have money for only one system), so my lenses can be ported to any mirrorless system. I'll decide which mirrorless system maybe in 2025 when the market settles.

Awesome info. Thanks for taking the time to explain everything. Super helpful.

Thanks for this great guide! Your channel has helped me a lot with lens choices for my C70 and R7. In the process of moving from EF lenses to RF. So far I only have the 15-35 2.8 but it sure has been an eye opener in terms of autofocus performance and the way it balances and feels on both cameras.

Right on. My favorite lenses fall into 5 buckets: 1) L series primes that I couldn’t bare to get rid of, 2) those funky Art primes (28, 40, 105) sharing a drop in filter adapter, 3) non-L RF primes cuz Sigma Arts are too damn heavy for travel, 4) L series zooms that Sigma don’t do (28-70, 100-500), and 5) Sigma Art zooms.

Thanks for a great analysis. I learned quite a bit. My experience is the same, only even more positive - I've used over a dozen EF and EF-S mount lenses, including a few very elderly ones, on my EOS-R. All have focused perfectly. Only 1 - an ancient Sigma 180mm macro - had a problem with the onboard lens correction - JPGs out of the camera with corrections on were funky. When I turned that off, it functioned perfectly. I recently added an R7 to my kit, and while I have less experience with EF on that, but so far, performance has been identical. For the record, my daily walkaround is the EF 24-105 f/4L mark 1 (almost 20 years old - bought it new) - I have at least 10k images with that lens on the EOS-R - it works perfectly (and honestly, the later versions aren't much better anyway). I kept it because of the adapters - especially the one with the filters. :D

Great video! I have the sigma prime art set, collected them over the years used as well. Just a good set to have for anything! And then my 15-35 RF for real estate and other work.

Great points. One other thing to consider regarding size and weight is where the weight is distributed. Especially with adapting EF lenses, that weight is typically not only heavier but thrown farther forward vs using a similar focal length RF lens. I've found this can really matter, especially with gimbals.

Thanks for another great one! Looking forward for a video about those 3 sigmas (28, 40 and 105)

I'm RF L lenses all the way but i'm very jealous of the versatility of the EF lenses!

The sigma 105/1.4 art is just another level. Such a beast for portraits. Heavy as he'll also though. Had it on my r6. Not the quickest AF but it get the job done. If I could afford it I would be satisfied with rf 35,85 and the 70-200 2.8 that's all I need. But they are like around 7000$ used in Sweden so ridiculous

I have 3 ef lens the Canon 16-35 F4 the Tamron 24-70 f2.8 G2 and the Irix 15 f2.5 they are great lenses. What I like about the R cameras is all the Nikon f mount and Konica vintage lenses I now own. Manual focus doesn't bother me a bit.

Once again very informative video, thank you and much appreciated.

You can get some great used Sigma Art lenses for the price of one RF

Best video on this topic yet! What do you think about Tamron EF lens? and the quality/performance of 3rd party RF lens?

I had 80D and just got R7 should I buy EF lens?

I have the canon pass through and the focal reducer. The later is fantastic. I have plenty of EF L lenses and that essentially makes it behave like it was on a full frame body (no improved bokeh but you get the extra stop of light). I’m hoping Canon add plenty of Z power lenses as only the 28-70/2, 24-105/2.8 and 100-300/2.8 peak my interest in the RF mount range

Thank you for this video. Still deciding on which lenses to invest in for my komodo and leaning RF since the auto focus is pretty great, but also have to factor that it's super 35 sensor and RF lenses are full frame. would be interesting to see an RF to RF speed booster but until then, we gotta accept the cropping. I own the sigma 18-35 f/1.8 and that autofocus is really good on komodo (not noisy either). All depends on workflow and sometimes having the drop in filter is nice for run and gun situations. Next lens is either the 24-105 RF or EF. But also trying to get an R5C soon. Lots to consider, but your video definitely helped!

This is just GREAT info, Thanks Josh!

Very informative! I’m considering going RF mount!

the best Channel for filmmakers , thanks

I'll tell you my story: my choice is Canon r6 mark ll. But the budget only allowed me to buy a body. I also purchased a Meike adapter with a built-in ND filter. This adapter is 3 times cheaper than Canon, but the quality is excellent! My thoughts on optics: for now I use rental optics, even cinema. But I will buy RF lenses. Thanks for video!

I currently own an R6 MKII and a Canon C70. I use Sigma lenses, a set of primes (24, 35, 50) and a set of zooms (18-35 and 24-70) and a few other Canon EF lenses such as the Canon 100m L, 70-200 L and the Tokina 11-16mm. I work full time as a content creator for brands and businesses. The reality is, upgrading and investing in Canon RF lenses just won’t make more money for my business and I believe that this is a very important question to ask as this is purely a business investment for most. It might improve user experience, however is that improved user experience worth the investment as well?

Hey Josh, I know your channel focuses more on video than photography but it should be worth mentioning to viewers(or specifically to those shopping the older EF lenses) that the H+ burst photo modes don't work with all Canon EF lenses or 3rd party EF lenses nor does the IS/VC work well on Sigma or Tamron adapted EF lenses. I agree people should stay away from the older Canon EF or mark I lenses as many users on Reddit and other forums have noted that the C70/R5C camera's don't even let you hit record let alone change the aperture with some older EF glass! Also, I second the Meike EF-RF VND adapter, the Meike VND has less colour shift than the Canon VND does too.

A lot also depends on what you intend to do with the gear. If you plan to spend a lot of time in a studio, sticking with EF lenses makes sense. When you intend to travel around quite a bit, trading in your EF glass for much lighter RF glass can significantly decrease the weight you have to carry around. I'm not a professional photographer (it's more of a hobby I invest a lot into), but I'm extremely happy with the affordability, quality, versatility and decreased weight of Canon's non-L lenses. The 100-400 is an amazing lens, and finally having affordable access to an 800 for wildlife shooting is a game changer for me.

What would recommend for using Olympus lenses to Canon RF?

I just purchase R 8 with EF to RF adaptor.

I just want to use my RF lenses on one of those fancy freefly ember cameras and still use the autofocus

I had a weird problem with the old EF 24-70 2.8 f2.8 mk1 on the R6 where the in-camera stabilizer would sometimes make a clonking noise with visible picture distortion like it shifted to its most extreme value and bumped into a stop. couldnt find anything online and never had problems with any other lenses. as this lens is not up to current sensor resolutions anyway and i wanted a fast stabilized zoom for filming with the R5C i sold it anyway and got the RF 24-70 2.8 IS which is a joy to use. i never liked 24-70 2.8 zooms as they are just a bread and butter work utility and always used fast primes when possible but that lens stays on quite often. i did not see any reason so far to sell my EF sigma ART primes and the EF 135mm f2 as they all just work brilliantly on the R6 and R5C. and there is no RF counterpart for the EF 85 1.4 IS.

I want an r8, if I get an 70-250 EF lens, does the autofocus work as well?

Hello Josh, might be the wrong part of your site but can you answer a question for me. i have purchased a Vintage Hinimex automatic 28mm to fit a 49 . i use only canon 250D and canon 700D. can you tell me with this info what conector i need to join them up?

Having Trouble finding the Speedbooster in stock by viltrox

Thanks Josh 🙂

Hi Josh, still trying to make sense of the speed booster adapter. Does it add any benefit when used with EF lenses on a Canon full frame camera like the new R5 II?

Sir... i have canon m50 mark ii and I just bought 100-400mm rf lens...what Adapter should I use??

Saw you today at NAB dude!!

So many adapters!!!!

You don't get full IBIS with adapter

Some people like the EF lens better because the new RF lens can too sharp. There is a view of the Canon RF 85mm f1.2 vs the Canon EF 85mm f1.8 and if you read the comments people liked the Canon EF 85mm f1.8 better. People want to look at a nice photo of a person not all the cracks and holes in their faces with these newer lens.

Hi Josh, great vid. I have RF, Sigma and EF. ☕📸🌋🌴👍🏻☀️🏝

Thanks. adapters difficult to get specially the combo RF. are there Sony-E to RF?

I thought Canon did a cease and desist with Metabones's speed boosters?

You forgot to EF to Z mount adaptor...🤣🤣

RF lenses suck compared to EF lenses. Especially Type III

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Make sets light and simple. Don't try the old school way.

Why oh WHY are you not even bothering to mention that Canon is DISCONTINUING EF lenses (and camera bodies), and that means that people should really start looking in to RF much sooner? This is a huge hole in your comparison - the fact that eventually Canon will stop supplying parts for EF lenses and that the RF mount - like it or not - is the next stage of Canon's evolution?? In that sense, why are we even having this conversation about adapters since it's got a shelf life you don't even mention?