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Can You Use Canon EF And EF-S Lenses On Mirrorless Canon Cameras?

With the rise in popularity of mirrorless cameras, many people are looking to make the move from DSLRs to mirrorless cameras. 

By making this change you might be considering if you can still use your current DSLR lenses on your new mirrorless cameras and luckily there are ways to make this happen. 

The short answer is: 

Yes, you can use Canon EF/EF-S lenses on mirrorless Canon cameras but you will need to use an adaptor.

This post focuses on people with Canon DSLR’s and EF/ EF-S lenses moving to a new Canon mirrorless camera with either the EF-M or RF mount.

For example you might want to use EF or EF-S lenses on a Canon EOS M50.

Read on to find everything you need to know when using these Canon DSLR lenses on mirrorless cameras.

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Which Canon Mirrorless Cameras Can Use EF And EF-S Lenses?

Canon has two mounts within their mirrorless line up, with the EF-M being the APS-C variant while the RF mount being the full frame variant. 

Canon has made it possible to use all EF and EF-S lenses with all of Canon’s new mirrorless cameras with the use of an adapter. 

What Lens Adapter Do I Need? 

Luckily there are quite a few options when it comes to lens adapters to make your EF/ EF-S lenses work with your mirrorless Canon camera. 

Just make sure you do get one which is designed for Canon products since there are various adapters out there for different uses.

For example, you would not want to buy an adapter which allows you to use Canon lenses on Sony mirrorless cameras as those are designed for the Sony mirrorless cameras with the Sony E-mount. 

Here are some options that are suitable for Canon lenses to be used on Canon cameras:

EF/EF-S To EF-M Mount

Canon Lens Mount Adapter EF-EOS M 

Viltrox Canon Lens Mount Adapter EF-EOS M


Canon Drop-in Filter Mount Adapter EF-EOS R with Variable ND Filter

Canon Mount Adapter EF-EOS R

Commlite Canon Mount Adapter EF-EOS R

**Make sure you are getting an adapter which matches your camera’s mount type. 

What Happens If I Use An EF-S Lens On A Full Frame RF Mount Camera? 

As you know EF-S lenses are designed for use on APS-C crop sensor cameras so you wouldn’t normally be able to use them on full frame DSLRs. 

However, with the use of an adapter you can actually use EF-S lenses on any RF mount full-frame mirrorless camera.

You just have to remember that the camera will automatically crop in to compensate for the APS-C lens and only use a portion of the image sensor. 

What Is The Crop Factor When Using An EF-S Lens On An RF Mount Camera? 

Similar to using a standard Canon crop sensor DSLR, the crop factor when using EF-S lenses on an RF mount camera is 1.6x. 

Keep in mind that when this crop is taking place, the camera is only using a portion of the full image sensor so you are losing a lot of the pixels. In fact, you lose roughly two thirds of the pixels. 

Let’s look at one RF mount camera as an example:

Canon EOS R

The EOS-R sensor with 30 megapixels becomes 11.6 megapixels when using an EF-S lens with the adapter. 

As you can see you need to consider image quality when using adapters to use EF-S lenses on RF cameras. 

What Happens When I Use An EF Lens On An RF Mount Camera Body?

Unlike with the EF-S lenses, using an EF lens with an adapter on an RF mount camera will result in no loss of quality in terms of megapixels used because you will be making use of the full sensor. 

What Happens When I Use An EF Lens On An EF-M Mount Camera Body?

As with standard APS-C Canon DSLRs, an EF lens will just work the same but have a crop factor applied.

EOS M cameras have a crop factor of about 1.6x which mirrors that of the APS-C DSLRs in Canon’s EOS lineup.

What Happens If I Use An EF-S Lens On An EF-M Camera?

As with a crop sensor DSLR, using an EF-S lens on an EOS-M camera will just have a 1.6x crop factor applied. 

Can I Use EF-M lenses On RF Mount Cameras?

While it would be nice to be able to just use all Canon lenses interchangeably, it’s not that easy.

Similar to EF-S lenses not being used on full frame Canon DSLRs, you are unable to use EF-M lenses on Canon RF mount cameras.

If you want to future proof then go straight for an RF mount camera if you have the money. Unfortunately you cannot go the other way either.

In the DSLR system, you can use EF lenses on APS-C DSLRs, but you cannot use the RF mount lenses on EF-M bodies.

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