topic Re: What's the difference between Canon RF and EF lenses? in EF & RF Lenses

What's the difference between Canon RF and EF lenses?

kamal123 — Wed, 30 Jul 2025 10:13:18 GMT

Hi All,

I'm Kamal Hinduja, based in Geneva, Switzerland (Swiss) . Can anyone share in detail what the difference is between Canon RF and EF lenses?

Thanks, Regards

Kamal Hinduja Geneva, Switzerland

Re: What's the difference between Canon RF and EF lenses?

shadowsports — Wed, 30 Jul 2025 11:12:26 GMT

Greetings,

The two biggest differences between the EF and RF mount are flange distance and communication speed.

EF mount flange distance 44 mm

RF mount flange distance 20 mm

The bidirectional communication between the camera and an RF lens is also much faster on RF than EF lenses.

Re: What's the difference between Canon RF and EF lenses?

March411 — Wed, 30 Jul 2025 12:40:13 GMT

EF lenses use 8 pins to communicate with the body. When used on an RF body it might impact the advanced features burst rate and performance improvements offered by RF lenses, especially the communication and image stabilization

RF uses 12 pins to communicate with the body results in faster data transfer between lens and body, enabling more sophisticated control and corrections

Re: What's the difference between Canon RF and EF lenses?

kvbarkley — Wed, 30 Jul 2025 13:02:47 GMT

The main difference is that EF lenses are for dslrs with the EF mount and RF lenses are for mirrorless cameras with the RF mount

Re: What's the difference between Canon RF and EF lenses?

kamal123 — Tue, 16 Sep 2025 09:31:04 GMT

Great answer.

Thanks, Regards

Kamal Hinduja Geneva, Switzerland

Re: What's the difference between Canon RF and EF lenses?

kamal123 — Tue, 16 Sep 2025 09:33:28 GMT

Thanks for Providing Valuable Information.

Thanks, Regards

Kamal Hinduja Geneva, Switzerland

Re: What's the difference between Canon RF and EF lenses?

kamal123 — Tue, 16 Sep 2025 09:34:06 GMT

Valuable information.

Thanks, Regards

Kamal Hinduja Geneva, Switzerland

Re: What's the difference between Canon RF and EF lenses?

jrhoffman75 — Tue, 16 Sep 2025 10:33:39 GMT

https://www.usa.canon.com/learning/training-articles/training-articles-list/still-using-a-dslr-consider-stepping-up-to-mirrorless-part-3?utm_source=promotional&utm_medium=email&utm_campaign=20250915_CAMERA_DSLR_STEPUP&riid=516391425&mi_u=516391425&mi_ecmp=20250915_CAMERA_DSLR_STEPUP

Re: What's the difference between Canon RF and EF lenses?

wq9nsc — Tue, 16 Sep 2025 13:29:31 GMT

If you are looking at high end lenses and aren't price averse, buying new RF glass for your R series body is the way to go. If you are price limited, it is a little more complex because used comes into play and I would go with a L level prime or zoom in the EF series with adapter over a lower end RF series lens. Of course you also have to factor warranty and cost/ability to repair when looking at a used lens so it comes down to a personal decision. I would always go higher optical quality used over lesser grade new if I were constrained to a price point requiring that decision but others will come down on the other side of the equation.

The RF lens do have a faster communications bus and this can sometimes limit frames per second speed with R bodies given the need to rapidly step the aperture between "look" and capture apertures at a high frame rate but the mechanics of focusing even in a prime is far more involved and communications speed is far less of a factor since the limiting factor is generally the inertia, overshoot, and hysteresis involved in moving multiple elements as opposed to aperture change which just involves simple movement of extremely lightweight blades.

My advice has always been to buy the best "glass" in your price range in order to have the best possible image quality and system performance. My choice of camera body and lens has always been driven primarily by sensor performance in lower light settings and lens quality (maximum aperture, focusing speed, and overall image quality). Good lenses are good for a very long time. I have the last version of the 70-200 ef 2.8 IS Canon produced but last weekend I was shooting some senior/parent celebrations at a football game where I wanted to use a higher pixel count camera so my late version EF 70-200 f2.8 and EF 400 f2.8 lenses were on a pair of 1DX III bodies on a camera harness for game use while I had the original non IS EF 70-200 f2.8 I bought with my first Canon digital (1D Mark II) back in 2004 mounted on a 5DS R body and it still works perfectly and produces perfect images.

Rodger

Re: What's the difference between Canon RF and EF lenses?

ebiggs1 — Tue, 16 Sep 2025 14:01:27 GMT

"Can anyone share in detail what the difference is between Canon RF and EF lenses? "

Optically or IQ wise I doubt many will see any difference and that is the main most important thing isn't it. It's the nice to have and the must have thingy. Get what works for you which does include price as well as IQ and or features.

Re: What's the difference between Canon RF and EF lenses?

mikesteve — Wed, 01 Oct 2025 05:35:29 GMT

The difference between Canon RF and EF lenses is mainly about compatibility and design. EF lenses were made for Canon’s DSLR cameras, while RF lenses are specifically designed for the newer mirrorless R series. With RF lenses, you get faster communication between lens and body, better autofocus, and often sharper optics in a smaller size. EF lenses can still be used on RF cameras if you add an adapter, so they’re still useful, especially if you already own them. Many photographers I know in Lahore, including those shopping at Hope Enterprises (a trusted camera shop in Lahore), are gradually moving towards RF lenses because that’s clearly the future of Canon’s system.

Re: What's the difference between Canon RF and EF lenses?

March411 — Wed, 01 Oct 2025 12:24:54 GMT

With all due respect mikesteve, Canon ensured compatibility with EF lenses on its R series mirror-less cameras by releasing the ER/RF adapter. The Canon EF to RF adapter does not affect image quality because it is an optical spacer with no glass elements. It only provides the correct distance to the sensor and electrical connections for communication with the lens. You will achieve the same image quality with your EF lenses on an RF mount camera.

Using an EF lens with stabilization on an RF camera can actually improve stabilization. The camera can more intelligently communicate/coordinate with the lens and its images stabilization system. The adapter performs as a pass-through, maintaining full electronic communication between the lens and the R-series camera body. This means full auto focus, image stabilization, and metadata transfer are retained.

All that being said, some older EF lenses may not focus as quickly on an R-series body as a native RF lens, particularly during high-speed continuous shooting. Additionally, lens designs have continued to improve even as it pertained to the the latest EF lenses added to the Canon lens product line. The one area that will stand out is that overall RF lenses are lighter than their EF counterparts.

With some research you will find that many professionals and enthusiasts still use and purchase EF lenses after moving to the R series body.