With the added thickness of this converter on a full frame, is, for instance, a 50mm lens still a 50mm lens or more like a 60mm?

OK, you need some knowledge, let me help. The basic answer is that it is still a 50mm lens, or whatever the lens is it is not effected in this way. For more info, read on. To start, you have adapting confused with crop factor, and crop factor only applies to sensor size, not the distance the lens is to the sensor. And to make it even more muddy, crop factor doesn't change the focal length of the lens, it changes the field of view. I'll try to explain each thing.. Adapting - So, this adapter makes it so older EF lenses can work on the new RF system. The new cameras do not have the mirror the older cameras do, and thus allow the new lenses to be placed much closer to the sensor. This is called "flange distance". Lenses are designed to focus based on this lens distance. So the older lenses require a much longer flange distance, and the adapter creates that space, otherwise the lenses wouldn't be able to focus (or fit, they are engineered to make it so you can put them on the wrong camera). It makes no changes to the function or properties of the lens, and no crop factor applies. Crop Factor - This can get complicated, I will try to stick to the basics. Crop factor only applies if the sensor size is different, usually in this case it means the sensor is smaller, but some sensors can use a "crop mode" which uses a smaller version of the sensor. The physical properties of the lens are the same; a 50mm lens is still 50mm, but it's overall angle of view is reduced (on Canon it's reduced by 60%). So it frames more like what an 80mm lens would on a full frame camera. Really, crop factor only exist because at one point there were 35mm film camera users that were coming into the digital world, and the most affordable cameras were these APS-C "crop" cameras. So they would put an 85mm lens on to take a portrait, only to find the angle of view was now much less, that what they really needed was a 50mm lens for the same use. So crop factor was made as a way for them to know what lenses were for what functions. Now, it's still a useful thing to know, but only if you know all the old tropes, to make it easier to select the proper lenses. When Crop Factor Applies - In any case, the lens or adapter is not relevant to when it applies, it only matters if using a smaller sensor size. Any crop camera will need it's crop factor applied to all lenses that are on it, even ones made only for crop cameras. This is because the standard for measuring lenses was created for 35mm format cameras, and that standard still applies, even to the smaller format lenses, because it is an industry standard. Some feel like crop only lenses should be labeled with their crop factor applied, but the thing is, that is I think a more muddy river than it currently is. People will want to know "why is it when I use this 24mm lens (crop) it is not the same as this other 24mm lens (full frame)?" And then they now have to learn to look out for lenses that can serve a completely different function on their camera than one that they think is the same. This way, a 24mm lens works the same no matter if for crop cameras or not. Probably a lot more info than you needed LOL.

What does the control ring get you that the basic adapter doesn't do?

They both adapt the lens to the RF mount, both use the same method to do so. Both have the same performance. The only difference is the control ring adds an additional control in the form of a dial that can be programmed to do several different things. This can be anything from changing the aperture, the shutter speed, ISO, exposure compensation (what I use it for), white balance, AF mode, and so on. It can only be one at any time, and you would set it up in the menu in the same way you would customize any other control. I would say if you have the R5, R6, or R3 then it is mostly not needed, mostly just a luxury that cost an additional 100 bucks. This is because those cameras have additional controls on them that can take the place of the ring. If you have the R or RP, then it might be a good idea to get the ring since they lack in the controls the other cameras have. Or, if you just want it, that is fine too. Otherwise, your lenses will behave exactly the same. If you would like more info about the adapter, you should check out the review I have on my profile. Here is a link. https://www.amazon.com/gp/customer-reviews/R27553TB7FWPCN?ref=pf_ov_at_pdctrvw_srp

Does it work with ef-s 24mm f/2.8 stm lens?

It actually does, yes. The adapter allows the use of all EF and EF-S lenses. However, as that is a crop lens, it will place the camera into what is called "crop mode" to mimic the smaller sensor size the lens was made for. This means that only 40% of the sensor will be used, and that certain video modes will no longer be accessible. So this is more or less just a way to help users coming from the older crop systems (like the Rebel line) to the new full frame models, where unlike the EF full frame cameras you can actually use your crop lenses on them via this adapter. Older DSLR full frame cameras had a mirror that could impact the rear of the smaller lenses, and that is why they could not be used on them. The new RF models no longer have the drawback, but the lenses still have too small of a projection to fill a full frame sensor, and thus the sensor "crops" down the images to make it so it works normally. You do lose some of your resolution, 60% roughly. So 20mp becomes 8mp, 30mp becomes 12mp, and so on. While it will work, I wouldn't suggest it as a long term solution, but at some point Canon is going to release RF crop series cameras, and this lens will be just fine on those. Maybe sometime late in 2022, or early 2023. In the meantime, as long as you don't mind the crop mode, this lens will work, but if you want something that works fine without the crop mode, gives the same general framing, look at the following... EF 40mm F2.8 STM - also a pancake lens, its basically the full frame version of the 24mm, and is also pretty affordable. RF 35mm F2.8 IS STM Macro - Probably the best "cheap" 35mm lens for the RF system. Usually 500 USD new, but sometimes reduced to 400. Surprisingly good lens, and does not need the adapter to use on an RF camera, but will not work on EF cameras.

If i buy the ef eos r adapter, do i need this control ring? tia

Technically no. They are both adapters for EF lenses to the RF mount, both perform the same function and they do it the exact same. However, this adapter cost twice as much, but adds an additional adjustment dial that can be set to change an individual setting. If you have and R3, R5, or R6, it really isn't much help, since they have three control dials. If you have the R, RP, R10, or R7, then it might be worth the extra 100 USD. For more info about the control ring adapter, check out the review on my profile. Here is a link. https://www.amazon.com/gp/customer-reviews/R27553TB7FWPCN?ref=pf_ov_at_pdctrvw_srp

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Reviews

A**L

Offical Canon Adapter, quality product

I decided to go with the Canon made adapter as I was hearing about either loose or too tight connection to lenses with third party ones, the control ring works really well adding an extra control dail at my finger tips (use for ISO), no issues with focus or image stablisation with the lens, I only have one issue and that is the price for offical Canon products, but that is the camera world. Recommended

15.05.2024

J**C

GREAT ADAPTER IF THE CORRECT ONE HAD BEEN SENT

GREAT ADAPTER THAT I ORDERED FIVE TIMES ON AMAZON IN AN ATTEMPT TO GET THE CONTROL RING VERSION, BUT EACH TIME THE NON-CONTROL RING VERSION WAS SENT INSTEAD. FIVE TIMES OVER TWO MONTHS I HAD TO RETURN IT. I EVENTUALLY I BOUGHT THE CONTROL RING VERSION IT FROM EBAY AND WITH THE CONTROL RING IT IS SO EASY AND GREAT TO USE. IT DOESN'T HAVE AUTOFOCUS, IMAGE STABILISATION, OR INTERFERE WITH THE PICTURE QUALITY AS IT IS JUST AN ADAPTER WITH NO GLASS ELEMENTS SO THEY ARE NOT RATED

29.01.2024

J**N

Brilliant product, but message the seller

A nice simple gadget that has saved me a lot of money! Like several others, I was sent the wrong product when I first ordered and it had to go back. If you are uncertain, it could be worth messaging the sellers and asking if the box says "control ring", as I did.

29.07.2024

P**L

Keep your favourite lenses

I was pleased to find I could upgrade to the latest mirror-less canon camera without the expense of new lenses. They all work perfectly with the adapter and it adds the control ring too, so most of the functionality of the new lenses is still there. If your lens was good quality before it still will be plus the camera will add to your keep rate.

3.11.2023

M**S

The Control Ring is Excellent, But Be Sure You Get The Correct One

For many Canon users, the main appeal of this adapter is the ability to use the vast array of fantastic EF mount lenses we've collected over the years on the new R-series mirrorless bodies. This lets me continue using everything from quirky third-party lenses to my reliable Canon L-series glass. Given the cost of new RF lenses, this adapter is an essential and cost-effective bridge, allowing you to enjoy your existing lens collection with all the benefits of the new camera system without having to replace an entire lens collection. In my experience, EF lenses will perform just as well, or better, on an R-series camera with this adapter than they ever did on a DSLR. While this is a pricey adapter (as is always the case in photography), much of that cost is for the excellent control ring. If you don't think you'll use that feature, Canon's standard version is a more affordable option. However, the ring itself is exceptionally well-made. It has a grippy texture that's easy to use even with gloves on, and the tactile, satisfying click at each step is perfect for dialling in settings with precision. Additionally, while this may be pricey for an adapter, it pales in comparison to replacing all your lenses, and it allows you to pick up some great bargains on quality EF lenses. A warning to anyone ordering this item, however, there's a somewhat common occurrence where you'll order the control ring adapter, and the item you receive is, in fact, the much cheaper non-control ring item. This happened to me, and I went through five orders before getting the actual correct lens. Whether it's an issue with the item listings, or just an attempt at a scam, I'm not sure - but buyers beware!

3.09.2025

A**D

Canon kit at a more reasonable price

Great piece of Canon engineering, that allows me to use an older Canon zoom lense with my new Canon EOS R8 (amazing camera). Wanted to buy this adapter, but Canon merchandise is expensive and then I came across this supplier. Would definitely recommend.

11.07.2024

L**S

Not controle ring type

This is not a controle ring type although all the pics are of the controle ring type, is just the normal one. So £177 for a normal adaptor that you can get for £104 on amazon.

8.03.2025

T**R

Does what it says on the tin

Just to confirm I was correctly sent the control ring version as stated. No problems, all my lenses work with the new camera, including a Samyang model. Just remember to update the camera settings to enable "Shooting without lens" and everything works.

5.01.2024

S**R

it gives me the ability to use my new Canon mirrorless camera with my old lenses set

10.05.2023

T**S

Bom preço. Cumpre bem a função

12.11.2025

K**D

الشحن سريع وقبول استرجاع المنتج رائع المنتج ممتاز جدًا واصلي ولكن لايطابق الصورة المعروضة

31.12.2023

A**Y

The adapter is very comfortable to hold, and the build quality is top notch. The ring moves very smoothly. On the EF side, I can attach any of my lenses, but on the RF side, I only have the original plastic cap for now [I haven't bought a camera yet]... ;)

10.09.2025

G**R

I have several Canon EF lenses, so this Canon Mount Adapter EF–EOS R is an absolute must-have to use them on my RF body. I upgraded from a third-party adapter — while there’s no major difference in autofocus or image quality, the Canon adapter feels more solid and reliable, with a perfect fit and finish. The control ring is especially useful on bodies like the EOS R, which have fewer customizable buttons. It adds a convenient way to adjust settings like ISO or exposure compensation on the fly. Overall, this is the recommended choice for anyone using EF lenses on an RF camera. If you’re an RF user with older glass, this adapter is the one to get.

8.10.2025

ASIN	B07H4LRRRQ
Best Sellers Rank	44,037 in Electronics & Photo ( See Top 100 in Electronics & Photo ) 474 in Camera Lenses
Brand	Canon
Colour	Black
Customer Reviews	4.5 4.5 out of 5 stars (1,607)
Date First Available	4 Sept. 2018
Focus type	Autofocus
Guaranteed software updates until	unknown
Included components	CANON CONTROL RING MOUNT ADAPTER EF-EOS R, Camera Cover R-F-3, LENS DUST CAP RF, Soft Case
Item Weight	130 g
Item model number	2972C001
Max Focal Length	1 Millimeters
Min Focal Length	1 Millimeters
Model year	2018
Package Dimensions L x W x H	13 x 11.9 x 8.2 centimetres
Package Weight	0.33 Kilograms
Part number	2972C002
Plug profile	Canon RF
Product Dimensions L x W x H	7.4 x 7.4 x 2.3 centimetres
Size	Full-Size
Water Resistance Level	Water Resistant

Canon Mount Adapter EF - EOS R, Compatible with EOS RP, EOS R, EOS R6, EOS R5

Description

Specifications

Reviews

Common Questions