Autofocus uses dual-pixel technology, and "Eye Detection AF" automatically focuses on human faces within the scene.

ISO sensitivity can be set to values between 100 and 40,000 by default, but the EOS R can be configured to expand the permitted range down to 50 and up to 51,200 or even 102,400.

[17] The Nikon Z 7 was announced several weeks before the EOS R.[2] The EVF uses an OLED screen with 3.69 million dots, offering a 100% view of the sensor image.

[6] The Canon EOS R does not feature a joystick,[13] but the touchscreen can be used in "Touch and Drag AF" mode to move the autofocus point.

This is used to find human faces within a scene and select an eye as the focus point, keeping track of it as the person moves around the frame.

[6] If the subject is too far away, "Eye Detection AF" instead focuses on the face as a whole, though firmware release version 1.4 increased the effective distance by a factor of about three.

[13] The autofocus system on the EOS R is able to focus at light levels down to -6 EV when using an f/1.2 lens and the central AF point.

[22] The Canon EOS R is able to capture 4K video at 30 fps, but only by using a cropped portion of the full sensor, making wide-angle views harder to achieve.

[18] Contemporary Sony mirrorless full-frame cameras do not close the shutter when powered off, and this can lead to problems with dirt on the sensor.

[6] The Multi-function Bar recognises swipe, tap-left, and tap-right actions, and each action can be configured to adjust a camera setting such as ISO sensitivity, view magnifier, autofocus method, MF peaking, white balance, and show/hide histogram or electronic level.

[28] Production of the EOS Ra was reportedly discontinued in late 2021,[29] but the model will be eligible for repair by Canon until January 2028.

[6] The EOS R is also compatible with Canon Speedlite flash heads, the GP-E2 GPS Receiver, and the Directional Stereo Microphone DM-E1.

The following lens models were available at the release date:[32] It is also possible to use older EF and EF-S lenses with one of the three available EF-EOS R mount adapters.

[4] After the announcement of the Canon EOS R, the absence of certain features led to a lot of criticism, often heated, in online forums, YouTube videos, and blogs.

[33][34][19] Particular criticism was levelled at Canon for the absence of anticipated features such as dual memory card slots, full-frame 4K video, and the lack of in-body image stabilization ("IBIS").

[38][39] Digital Photography Review called the new Canon RF lenses "simply spectacular" and praised the image quality and autofocus accuracy of the Canon EOS R, but felt that competing mirrorless cameras offered better video, wider dynamic range, and faster burst rates.

[45] With the initial release of the EOS R, the accuracy of its face/eye tracking autofocus mode was criticised as being weak when compared to the Sony mirrorless cameras.

[48] The innovative Multi-function Bar was largely dismissed by critics,[32][13] described as "superfluous",[37] "mystifying",[49] "impractical in use",[15] and a "fail".

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