Canon EOS R3 vs Canon EOS Rebel T3i

This is a full comparison between the cameras Canon EOS R3 and Canon EOS Rebel T3i. We compare them by looking at the categories you see below.

Manufacturing

These cameras are both manufactured by Canon.

Canon EOS R3 were released 2021 and Canon EOS Rebel T3i was released 2011. That is a 10 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Canon EOS R3 2021
Canon EOS Rebel T3i 2011

Type of camera

Canon EOS R3 is a Mirrorless camera while Canon EOS Rebel T3i is a DSLR camera. More information about their differences will come soon.

Sensors / crop factor

These cameras have different sensors. Canon EOS R3 has a "Canon Full Frame"-sensor while Canon EOS Rebel T3i has a "Canon APS-C"-sensor, and their difference in sensors will also affect the crop factor and experience focal length. See the table below.

Camera Focal length, 50mm f/1.8 **
Canon EOS R3 50 mm
Full-frame sensor
No crop factor/focal length multiplier
Canon EOS Rebel T3i 80 mm
Canon APS-C sensor
Crop factor/focal length multiplier by * 1.6

** Experienced focal length when using a lens such as a common "50mm f/1.8"

Learn more about crop factor and focal length multiplier here:
Camera selection can affect the focal length (Canon)

Resolution

Canon EOS R3 has a 24 MP (Megapixels) resolution while Canon EOS Rebel T3i has 18 MP. If we break down this in more detail this is the data behind the numbers:

Camera Megapixels
Canon EOS R3 24 MP
24000000 pixels
6000 x 4000
Canon EOS Rebel T3i 18 MP
17915904 pixels
5184 x 3456

Canon EOS R3 has a 34 % larger resolution than Canon EOS Rebel T3i. This could give you more details in the picture but also a possibility to crop more in the pictures, afterward while editing the pictures, if needed that is.

ISO range

Canon EOS R3 has a larger ISO-range than Canon EOS Rebel T3i. Canon EOS R3 has an ISO range that stretches from 100 to 102400 while Canon EOS Rebel T3i has 100 to 12800.

Camera ISO Range
Canon EOS R3 100-102400
Canon EOS Rebel T3i 100-12800

Autofocus and lens compatibility

Both of these cameras have a built-in autofocus motor. Some lenses, that support autofocus, do not have an autofocus motor of their own but this won't cause any problems with these two cameras.

Worth mentioning is that Canon EOS R3 belongs to the Canon EOS R-system and needs an adapter to work with Canons EF, EF-S, MP-E, and TS-E lenses. You can read more about this adapter here:
Canon Lens Mount Adapter EF-EOS R

Here is a complete overview of which lenses work with each camera:
Lens compatibility chart for Canon EOS R3
Lens compatibility chart for Canon EOS Rebel T3i

Pictures per second

Depending on what you are shooting the FPS, or frames/pictures per second, can definitely be of interest. Canon EOS R3 can shoot up to 30 pictures per seconds and Canon EOS Rebel T3i can shoot up to 3,7 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS R3 30
Canon EOS Rebel T3i 3,7

Ability to record movies

It is becoming more and more popular to record movies with digital cameras.

In this case, both Canon EOS R3 and Canon EOS Rebel T3i can shoot movies.

Weight

The weight of the camera can be an extremely important factor, especially if the camera is about to be used, or carried around, for several hours at a time.

Canon EOS R3 weighs 1015 gr (equal to 2.24 lb) which is 78% heavier than Canon EOS Rebel T3i and its 570 gr (or 1.26 lb).

Camera Weight
Canon EOS R3 1015 gr
2.24 lb
Canon EOS Rebel T3i 570 gr
1.26 lb

Canon EOS R3 vs Canon EOS Rebel T3i Specs

Below you will find the complete and detailed technical specs for both Canon EOS R3 and Canon EOS Rebel T3i, next to each other. Each category of data is a link to an article covering the subject, giving you a deeper understanding so you can better understand the strengths and weaknesses of the two camera models.

Product
Canon EOS R3
Canon EOS Rebel T3i
Name Canon EOS R3 Canon EOS Rebel T3i
Manufacturer Canon Canon
Release Date and Price
Canon EOS R3
Canon EOS Rebel T3i
Release Year 2021 2011
Release Date 2021-04-14 2011-02-07
MSRP 5999 USD 1099 USD
Buy it today
Camera Type
Canon EOS R3
Canon EOS Rebel T3i
Camera Type Mirrorless DSLR
Sensor
Canon EOS R3
Canon EOS Rebel T3i
Sensor Size Full Frame (approx 36 x 24 mm) APS-C (approx 22.3 x 14.9 mm)
Sensor Type Stacked CMOS CMOS
Resolution 6000 x 4000 pixels 5184 x 3456 pixels
Megapixels 24 MP 18 MP
Image Processor DIGIC X DIGIC 4
Image
Canon EOS R3
Canon EOS Rebel T3i
ISO Range 100 - 102400 100 - 12800
White Balance Presets 6 6
Custom White Balance No Yes
Image Stabilization Yes
(Sensor-Shift)
No
Image Stabilization CIPA Rating 0 stops 0 stops
Uncompressed format RAW RAW
Optics & Focus
Canon EOS R3
Canon EOS Rebel T3i
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Contract Detect (sensor)
Phase Detect
Multi Area
Selective Single Point
Single
Continuous
Face Detection
LiveView
Focus Points 1053 9
Lens Mount Canon RF

See Compatible Lenses
Canon EF
Canon EF-S

See Compatible Lenses
Focal Length Multiplier Full frame
No multiplier
Example:
24 mm remains 24 mm
50 mm remains 50 mm
100 mm remains 100 mm
200 mm remains 200 mm
APS-C Sensor
1.6x multiplier
Example:
24 mm becomes 38 mm
50 mm becomes 80 mm
100 mm becomes 160 mm
200 mm becomes 320 mm
Screen & Viewfinder
Canon EOS R3
Canon EOS Rebel T3i
Articulated LCD Fully articulated Fully articulated
Screen size 3.2” 3”
Screen dots 4150000 1040000
Touch screen Yes No
Screen type TFT LCD TFT color LCD, liquid-crystal monitor
Live view Yes Yes
Viewfinder Type Electronic Optical (pentamirror)
Viewfinder Coverage 100% 95%
Viewfinder Magnification 0.76× 0.85× (0.53× 35mm equiv.)
Viewfinder Resolution 5760000 N/A
Photography features
Canon EOS R3
Canon EOS Rebel T3i
Frames per second 30 fps 3,7 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/4000 seconds
Built-in Flash No Yes
Built-in Flash Range N/A 13 meters
External Flash Yes Yes
Self-Timer Yes Yes
Time-lapse Yes Yes
Metering modes Multi
Center Weighted
Spot
Partial
Multi
Center Weighted
Spot
Partial
Exposure Compensation +/- 3 (at 1/3 EV, 1/2 EV steps) +/- 5 (at 1/3 EV, 1/2 EV steps)
Videography features
Canon EOS R3
Canon EOS Rebel T3i
Video recording Yes Yes
Video format MPEG4
H.264
H.265
MPEG4
H.264
Video resolution 1920 x 1080
3840 x 2160
4096 x 2160
1280 x 720
1920 x 1080
Built-in Microphone Yes Yes
Built-in Speakers Yes Yes
Storage
Canon EOS R3
Canon EOS Rebel T3i
Memory Card Compact Flash Express
SD/SDHC
SD/SDHC
Connectivity
Canon EOS R3
Canon EOS Rebel T3i
HDMI Output Yes Yes
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Built-in (802.11ac + Bluetooth)
Yes
Eye-Fi Connected
Remote Control Yes (via smartphone) Yes (E3 connector, InfraRed)
GPS Yes
Built-in
No
Body & Dimensions
Canon EOS R3
Canon EOS Rebel T3i
Enviromentally sealed Yes No
Battery Built-in Battery Pack
Battery Details LP-E19 lithium-ion battery & charger
Lithium-Ion LP-E8 rechargeable battery & charger
Battery Life (CIPA) 760 shots 440 shots
Width 150 mm 133 mm
Height 143 mm 100 mm
Depth 87 mm 80 mm
Weight 1015 gram 570 gram