Nikon Z9 vs Canon EOS R3 – The 10 Main Differences

When mirrorless cameras first arrived on the scene, Canon and Nikon didn’t immediately believe in producing semi-pro and professional bodies, concentrating instead on more entry-level products such as the discontinued Nikon 1 system and the Canon EF-M APS-C series.

In 2018, they finally revealed, almost at the same time, their respective mirrorless full frame systems, which paved the way for their most advanced digital cameras ever, the Nikon Z9 and the Canon Eos R3.

Cover image with Nikon Z9 next to Canon R3, with title of the article on top

More comparison previews:

Canon R3 vs Sony A1
Nikon Z9 vs Sony A1
Nikon Z9 vs Canon R3

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1. Bye bye, mechanical shutter!

The Nikon Z9 becomes the third mirrorless camera, after the Sigma fp and fp L, to get rid of the mechanical shutter altogether, relying solely on the electronic shutter. It’s a brave move and shows the company is confident that its newly developed stacked sensor has the fastest readout time in the world, which makes the mechanical curtains redundant (it also means there is no shutter cycle expiring date to worry about).

I always thought a full time electronic shutter would be the next evolution in mirrorless cameras but I’ll be honest, I didn’t think it would came from Nikon first. Well done! There is also the option in the camera to have it completely silent, or to add a fake shutter sound.

30 images coming off the Canon R3 image sensor, concept image representing the fast continuous shooting speed

Canon kept both the mechanical and electronic options for the R3, and the electronic version on the EOS model is also very capable. Below you can see the main benefits of using the electronic shutter on both cameras.

Max. shutter speed1/32,000s1/64,000s
Max. flash sync1/250s1/180s
Max. drive speed20fps
30fps (JPG)
120fps (11MP)

The continuous shooting speeds are all available with AF and AE tracking on both cameras, and they work with live view and no blackouts, which means you’re seeing your subject live in the EVF while shooting, without any interruptions or lag (like the Sony A9 and A1 series).

frame grabbed from Nikon's promotional video explaining how the Expeed 7 processor can maintain live view while recording data.

Note that with the R3, the flash sync speed is a bit faster with the mechanical shutter: 1/200s (or 1/250s with the electronic first-curtain shutter).

Both Canon and Nikon claim no distortion when using the e-shutter (rolling shutter effect). This will be especially important for Z9 users because, if there were ever a problem, they wouldn’t have any other option. But given the user target of this camera, I’m sure Nikon made extensive tests in all sorts of situations and light conditions.

Concerning the buffer memory, the Z9 can save more than 1,000 images (JPG or High Efficiency compressed RAW) when recording at 20fps. I couldn’t find information about 30fps.

The Canon can save 540 JPGs or 150 RAW files at full speed when working at 30fps.

2. Sensor: 45MP vs 24MP

The Z9 and R3 incorporate full frame sensors with a stacked design, which allows both cameras to achieve very fast performance when it comes to sensor readout, continuous shooting speeds (as seen in the first chapter above), video frame rates and more. Additionally, the Canon sensor has a BSI structure (back-illumination).

The first difference we find concerns the resolution: the Z9 sensor has 45.7MP whereas the R3 uses 24.1MP.

Nikon Z9 sensor

Concerning the sensitivity range, fewer pixels on the R3 make for a wider ISO range. You can also note that the Nikon maintains almost the same range for stills and videos (unlike the Canon), starting from a normal base range of ISO 64.


The Z9 can record 14-bit RAW files with lossless compressed or the new High Efficiency option. The latter reduces the file size by half or two thirds, so that the camera can process a larger quantity of files more quickly.

The R3 can record with lossless RAW or compressed RAW (14-bit).

3. Machine learning autofocus

Both cameras feature the most advanced autofocus designed by the two companies respectively, and they rely on powerful algorithms and machine learning to recognise different types of subjects.

The Z9 uses 493 hybrid (contrast / phase) detection points and a very fast processing speed with 120 calculations per second (like the Sony A1).

The R3 uses the Dual Pixel CMOS AF II system with 1,053 areas and 60 calculations per second.

Screenshot of the Canon R6 live view, showing animal subject detection AF at work on a red kite flying under the blue sky

Both cameras can detect a variety of subjects and focus on different parts of the body, such as eyes for humans or animals, or helmets for racing cars. Here is the range of subjects they can track specifically. Note that the Z9 can detect any of these subjects automatically, whereas on the R3 you need to specify which one in the menu.

Subject det.Z9R3
HumansEyes, faces, torsosEyes, faces, torsos
AnimalsDogs, cats, birdsVarious (including birds)
VehiclesCars, bikes
planes, trains
Cars and bikes
close-up on the rear of the Canon R3, with Subject to Detect setting on the LCD screen

Nikon has also implemented 3D Tracking, its advanced tracking system that is very well known among DSLR users. It is the first time that this method is present on a Z-mount mirrorless camera.

The Z9 has a minimum sensitivity in low light of -6.5Ev, measured with an F1.2 lens. With the Startlight View assist, the rating goes down to -8.5Ev.

The R3 is one stop more efficient, with -7.5Ev, also measured at f/1.2.

4. 8K vs 6K video

The Nikon Z9 can record 8K video internally up to 30p. It offers a variety of codecs, including Apple Prores 422 HQ. This is the first mirrorless camera that can record with the popular professional Apple codec. But that is not all. The Z9 can also do 4K up to 120p. A future firmware will bring 8K 60p and 8K RAW internally.

back of the Nikon Z9 with the video settings menu

The Canon R3 may not reach 8K resolution, but its video capabilities are spectacular nonetheless, with 6K and 12-bit RAW available for internal recording.

There is no sensor crop on either camera, and no 30 minute recording limitation either.

Here is a recap of all the main specs:

8K 60/30pyes*
6K 60/30pyes
4K 120/60/30pyesyes
FHD 120/60/30pyesyes
CodecsProRes 422 HQ*
Bit depth10-bit / 8-bit10-bit / 8-bit
Max. bitraten.a.2600Mbps
Log / HDRYesYes
*Note: 8K only works with H.265. 8K 60p will work in 12-bit RAW (N-RAW / Prores RAW) and will arrive on the Z9 via firmware update.

Up to 30p, the Z9 does over-sampling, meaning it uses the 8K region to create the 4K footage, which enables superb details and sharpness. At 60p and 120p however, it’s not oversampling (but Nikon hasn’t mentioned if it is pixel binning or line-skipping).

The R3 does oversampling in 6K and 4K up to 60p.

close-up on back of the R3 with Movie Recording Size settings for video

5. In-body stabilisation

Both cameras feature 5-axis image stabilisation on the sensor. The Z9 reaches a compensation rating of 6Ev when using Z lenses with VR (optical stabilisation).

The R3 has a higher compensation rating of 8Ev, although keep in mind that the rating is not the same for all lenses.

computer generated image showing how the stabilisation system on the Canon R3 works

The 5-axis system can combine sensor and optical stabilisation, and is also valid during movie recording. Additionally, you add digital stabilisation (video only) to improve the result, although keep in mind that a small crop is applied. Canon calls this Digital IS, Nikon calls it Electronic VR.

The Z9 also locks the IBIS mechanism when the camera is turned off to avoid it being shaken if, for example, the body is on the rear seat of a car traveling on a bumpy road.

6. Viewfinder and monitors

The Z9 features an electronic viewfinder with 3.69M dots of resolution, which is not an impressive number considering that other competitors have 5M or even 9M dots. However Nikon claims that it is the brightest EVF on the market with 3000-nit. The magnification is 0.8x with a 60Hz refresh rate and a 23mm eye-point.

The R3 viewfinder has more resolution with 5.76M dots, but a slightly smaller magnification of 0.76x. The eye-point has the same length (23mm) but the refresh rate goes up to 120Hz.

All this said, the R3 has a unique feature you won’t find anywhere else: Eye Control AF. Inside the EVF there are 8 infrared sensors that read the position of your eyeball, and move the AF point or switch tracking from one subject to another simply by following the movement of your eye. In simple words, you can focus on a subject by simply looking at it.

graphic image showing how eye control AF works

As for the rear monitors, both cameras have a 3.2-in (8cm) LCD with touch sensitivity. The R3 features a superb 4.15M dots of resolution, which is double that of the Z9 (2.1M dots).

The moving mechanism is also different: that of the Nikon works on 4 axes, meaning you can also tilt it up and down when you work in portrait mode (vertical orientation). On the R3, you have the classic multi-angle movement, which means you can flip it 180˚.

Finally, both cameras have an extra monitor on top that displays the basic settings in use.

7. Design tidbits

The Z9 and the R3 are very robust cameras, with weather sealing and a magnesium alloy frame. The dimensions are very similar, but the Nikon is heavier.

  • Z9: 149 x 149.5 x 90.5mm, 1340g
  • R3: 150 x 142.6 x 87.2mm, 1015kg

Each cameras has its own button layout and controls. Things worth highlighting are the smart controller on the rear of the R3 (a ‘touchpad’ alternative to the normal AF joystick, which is also present). Most of the buttons on the Z9 are backlit.

Both cameras can cover the sensor when powered off to protect it. While the R3 uses the curtains of the mechanical shutter, the Z9 has a mechanism design only for this purpose, which should also be more robust.

sensor shield on the Nikon Z9

8. Cards, interface and battery life

The Z9 works with two cards, and they are both the CFexpress Type B standard.

The R3 also has two slots, but one for CFexpress cards and one for SD UHS-II cards.

Both cameras have a LAN / Ethernet port, USB Type C, microphone input, headphone output and a full size HDMI socket.

The battery life is similar for both cameras: the Nikon can do 740 frames with the LCD, or 700 with the EVF. The Canon does better with the LCD (860) but worse with the viewfinder (620).

9. Lenses

Both systems started in 2018 and today they have a good selection of native lenses to offer alongside the camera bodies.

Nikon has 19 full frame lenses, with the 100-400mm F4.5-5.6 launched alongside the Z9 (the longest telephoto lens at the moment), plus two teleconverters. There are high quality F2.8 zooms and super fast primes among other things.

Canon has 23 RF lenses going at the moment, including very fast F1.2 primes, the F2.8 trinity zoom and more super telephoto offerings than Nikon, as well as two focal extenders.

In both cases, you can use Canon EF and Nikon F DSLR lenses with an adapter, and both companies have made one. Nikon has also released the mark II version of its FTZ adapter. The performance when it comes to autofocus remains really good.

10. Price

The Z9 was launched at the retail price of $5500 / £5300 / €6000 for the body only, which makes it less expensive than the Canon model in some countries.

The R3 can be found for $6000, £5880 or €6000 (body only).

Prices as of late October 2021.


The Z9 and the R3 are two important cameras for their respective brands. After years of lagging behind their mirrorless competitors (Sony in particular) in terms of important innovations such as autofocus, stacked sensors and the electronic shutter, the two flagship cameras finally prove that Canon and Nikon are back in the game.

The Z9 in particular impresses me because Nikon has dared to go further than any other brand when it comes to video (internal 8K RAW) and shutter technology (by removing the mechanical curtains altogether), a move that neither Canon or Sony have made yet.

That said, the Z9 is not in a class of its own. The R3 is as capableas its counterpart in every way except the sensor resolution (24MP vs 45MP) and video (6K vs 8K), while also housing a few unique features of its own like the Eye Control AF.

And of course we mustn’t forget Sony, the brand that started the electronic shutter evolution with a 20fps drive speed and blackout-free EVF with the A9 in 2017, four years before Canon and Nikon, and has in the recent A1 a very strong competitor. High-end mirrorless cameras have never looked better than this.

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Check price of the Nikon Z9 on
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More comparison previews:

Canon R3 vs Sony A1
Nikon Z9 vs Sony A1
Nikon Z9 vs Canon R3

About The Author

Mathieu Gasquet

Photo of author

Mathieu Gasquet is the co-owner and editor of Mirrorless Comparison, as well as the man behind all the camera tests. Mathieu has been a professional photographer for over 15 years. Before specializing in camera reviews, he worked as an event photographer for the National Cinema Museum in Turin, and as a videomaker for renowned Italian agencies, which allowed him to collaborate with important names such as Fiat, Sky Italia, Maserati, and more. Mathieu also studied cinema in France and obtained a degree in cinematography at the A.R.F.I.S. school in Lyon.

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