Everything You Need To Know About Canon RF-S Lens Mount

Canon recently launched the EOS R7 and EOS R10 – two affordable APS-c sensor mirrorless cameras – along with the RF-S 18-45mm F4.5-6.3 IS STM and RF-S 18-150mm F3.5-6.3 IS STM lenses. This is the first launch of a new range of cameras and lenses, so here’s everything you need to know about Canon RF-S lens mount !

So let’s start and define what is the Canon RF-S lens mount, APS-c and crop sensor?

The big advantage of the smaller APS-C sensor compared to the full frame cameras is the 1.6x crop which extends your effective focal length of lenses. This is ideal for wildlife, sports and action photography. The EOS R7 and EOS R10 are the first enthusiast level APS-C sensor mirrorless cameras in the EOS R series line-up.

RF and RF-S lenses offer higher quality, speed, and operation thanks to outstanding optical technology and design. Designed for the future with improved video capabilities, plus neat touches like the control ring and more compact size.

What is Canon RF-S Lens Mount?

The Canon RF-S lens mount is actually the same as the full-frame Canon RF lens mount but the RF-S lenses produce a smaller image circle than RF lenses. The first Canon RF-S lens mount products are the RF-S 18-150mm F3.5-6.3 IS STM and the Canon RF-S 18-45mm F4.5-6.3 IS STM. As they are designed to be used on the company’s new APS-C format EOS R7 and R10, their focal lengths are subject to a 1.6x magnification factor. That means that the RF-S 18-150mm F3.5-6.3 IS STM produces images that are comparable with a 28.8-240mm lens on a full-frame camera while the RF-S 18-45mm F4.5-6.3 IS STM is equivalent to a 28.8-72mm lens.

Canon RF-S lenses vs Canon EF-S lenses

Will Canon’s new RF-S lenses only fit APS-C EOS R bodies like the EF-S models? Actually no. The marked difference between Canon RF-S lenses and Canon EF-S lenses is that EF-S lenses will only fit on crop-sensor APS-C Canon DSLRs like the EOS 90D or 7DMKII. You simply can’t use EF-S lenses on full-frame EOS DSLR cameras as they have an EF mount.

On the other hand Canon RF-S lenses will fit on both APS-C Canon mirrorless cameras like the R7 and R10, and full-frame EOS R mirrorless cameras like the R5 & R6. However you have to switch to crop mode turning your full-frame product into an APS-C camera.

Will there be more Canon RF-S lenses?

At the big press launch in London of the new EOS R7 and R10 and RF-S lenses, Canon hasn’t said anything about its future plans for the RF-S lens range. We can clearly expect more optics to come over the coming months.

It would be good to see the RF-S equivalent of 24-70mm (15-43mm) f/2.8 and f/4, 70-200mm (43-125mm) f/2.8 and f/4 lenses, plus some longer zoom lenses for wildlife photography, a few fast primes and a macro lens. Below you can see the rumored Canon RF-S lens roadmap in case you’ve missed it in our previous reports.

  • Canon RF-S 22mm f/2 STM
  • Canon RF-S 11-55mm f/4-4.5 IS STM
  • Canon RF-S 55-250mm f/4.5-7.1 IS STM
  • Canon RF-S 16-55mm f/2.8 IS USM
  • Canon RF-S 32mm f/1.4 STM

Can I use the Canon EOS R7 or Canon EOS R10 with EF and EF-S lenses?

Yes, but you need to use an adapter to get the EF or EF-S lens to fit on the R mount of the new Canon R7 and R10. See below for the EF to RF lens mounbt adapters.

Canon EF to RF Lens Mounts Adapter

Mount Name Check Price
EF to RF Amazon | BHphoto
EF to RF + Control Ring Amazon | BHphoto
EF to RF + Filter V ND Amazon | BHphoto
EF to RF + Filter Polarizer Amazon | BHphoto

The new Canon EOS R7 and EOS R10 APS-C mirrorless cameras now available for pre-order. All the products are available B&HAdorama.

RF-S 18-45mm F4.5-6.3 IS STM $299.00 B&HAdorama
RF-S 18-150m F3.5-6.3 IS STM $479.00 B&HAdorama
Canon EOS R7 $1,499.00 AmazonB&HAdorama
Canon EOS R10 $979.00 AmazonB&HAdorama

See also Updated Canon RF Lens Roadmap 2022-2023

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One thought on “Everything You Need To Know About Canon RF-S Lens Mount”

  1. Basically they will be converting all the M series lenses to RFs, hope they improve the glass quality to enable the full benefit of the 32 megapixel sensor.

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