Compatibility Check: Is Canon EOS R5 and Canon EF 85mm F1.8 USM compatible?

Below you will find your chosen camera and lens with a short product summary. Further down you will see details around their compatibility, if they are compatible or not.

Canon EOS R5
Canon EOS R5

Released: 2020
Camera Type: Mirrorless
Sensor: Full frame
Resolution: 45 Megapixels
8192 x 5464 pixels

Canon EF 85mm F1.8 USM
Canon EF 85mm F1.8 USM

Released: 1992
Focal Length: 85 mm
Aperture: f/1,8
Image Stabilization: No
Weight: 425 gram

Can you combine these two?

Last updated: November 2024

This is the short answer:

The camera and lens you have chosen can be used together if you use the desired adapter.

You must use an EOS R adapter

This Canon lens is not part of the Canon EOS R-system but it can still be used with Canon EOS R cameras. To use this lens on this camera you need an adapter.

Canon Lens Mount Adapter EF-EOS R

Focal Length

The Canon camera has a sensor of type Full frame which means that your experienced Focal length will be the same as the lens specification tells us.

This lens has focal length:
85 mm

Since Canon EOS R5 has a Full Frame sensor this is also the focal length you will experience.

Total weight

When you are looking at a combination of a camera and a lens you must always consider the total weight. Each product weighs in at:

Canon EOS R5
738 gram

Canon EF 85mm F1.8 USM
425 gram

Together they have a total weight of 1163 gram (equal to 2.56 lb).

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Validation Status: Valid
Valid Camera: Yes
Valid Lens: Yes
Compatible: 2
Compatibility Check ID: 1500
Henrik Törner

Written by Henrik Törner

Camera Expert and Founder of Cameraby


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