Canon EOS R3 vs Canon EOS 1D Mark III

This is a full comparison between the cameras Canon EOS R3 and Canon EOS 1D Mark III. 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 1D Mark III was released 2007. That is a 14 years difference. In tech, this period can be of interest since technology is always improving, etc.

Camera Released
Canon EOS R3 2021
Canon EOS 1D Mark III 2007

Type of camera

Canon EOS R3 is a Mirrorless camera while Canon EOS 1D Mark III 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 1D Mark III has a "Canon APS-H"-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 1D Mark III 65 mm
Canon APS-H sensor
Crop factor/focal length multiplier by * 1.3

** 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 1D Mark III has 10,1 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 1D Mark III 10,1 MP
10077696 pixels
3888 x 2592

Canon EOS R3 has a 138 % larger resolution than Canon EOS 1D Mark III. 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 1D Mark III. Canon EOS R3 has an ISO range that stretches from 100 to 102400 while Canon EOS 1D Mark III has 50 to 6400.

Camera ISO Range
Canon EOS R3 100-102400
Canon EOS 1D Mark III 50-6400

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 1D Mark III

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 1D Mark III can shoot up to 10 pictures per seconds.

Camera FPS (Frames per second)
Canon EOS R3 30
Canon EOS 1D Mark III 10

Ability to record movies

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

When comparing these two cameras there is only one of them that can shoot movies and that is Canon EOS R3. Unfortunately Canon EOS 1D Mark III does not support recording movies and movie clips.

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 1D Mark III weighs 1155 gr (equal to 2.55 lb) which is 14% heavier than Canon EOS R3 and its 1015 gr (or 2.24 lb).

Camera Weight
Canon EOS R3 1015 gr
2.24 lb
Canon EOS 1D Mark III 1155 gr
2.55 lb

Canon EOS R3 vs Canon EOS 1D Mark III Specs

Below you will find the complete and detailed technical specs for both Canon EOS R3 and Canon EOS 1D Mark III, 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 1D Mark III
Name Canon EOS R3 Canon EOS 1D Mark III
Manufacturer Canon Canon
Release Date and Price
Canon EOS R3
Canon EOS 1D Mark III
Release Year 2021 2007
Release Date 2021-04-14 2007-02-22
MSRP 5999 USD 3999 USD
Buy it today
Camera Type
Canon EOS R3
Canon EOS 1D Mark III
Camera Type Mirrorless DSLR
Sensor
Canon EOS R3
Canon EOS 1D Mark III
Sensor Size Full Frame (approx 36 x 24 mm) APS-H (approx 27.9 x 18.6 mm)
Sensor Type Stacked CMOS CMOS
Resolution 6000 x 4000 pixels 3888 x 2592 pixels
Megapixels 24 MP 10,1 MP
Image Processor DIGIC X DUAL DIGIC 3
Image
Canon EOS R3
Canon EOS 1D Mark III
ISO Range 100 - 102400 50 - 6400
White Balance Presets 6 8
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 1D Mark III
Autofocus Motor Yes Yes
Autofocus Contract Detect (sensor)
Phase Detect
Multi Area
Center
Selective Single Point
Tracking
Single
Continuous
Touch
Face Detection
LiveView
Phase Detect
Multi Area
Selective Single Point
Single
Continuous
Focus Points 1053 19
Lens Mount Canon RF

See Compatible Lenses
Canon EF

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-H Sensor
1.3x multiplier
Example:
24 mm becomes 31 mm
50 mm becomes 65 mm
100 mm becomes 130 mm
200 mm becomes 260 mm
Screen & Viewfinder
Canon EOS R3
Canon EOS 1D Mark III
Articulated LCD Fully articulated Fixed
Screen size 3.2” 3”
Screen dots 4150000 230000
Touch screen Yes No
Screen type TFT LCD N/A
Live view Yes Yes
Viewfinder Type Electronic Optical (pentaprism)
Viewfinder Coverage 100% 100%
Viewfinder Magnification 0.76× 0.76× (0.58× 35mm equiv.)
Viewfinder Resolution 5760000 N/A
Photography features
Canon EOS R3
Canon EOS 1D Mark III
Frames per second 30 fps 10 fps
Minimum Shutter Speed 30 seconds 30 seconds
Maximum Shutter Speed 1/8000 seconds 1/8000 seconds
Built-in Flash No No
Built-in Flash Range N/A N/A
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) +/- 3 (at 1/3 EV, 1/2 EV steps)
Videography features
Canon EOS R3
Canon EOS 1D Mark III
Video recording Yes No
Video format MPEG4
H.264
H.265
N/A
Video resolution 1920 x 1080
3840 x 2160
4096 x 2160
N/A
Built-in Microphone Yes No
Built-in Speakers Yes No
Storage
Canon EOS R3
Canon EOS 1D Mark III
Memory Card Compact Flash Express
SD/SDHC
Compact Flash
SD/SDHC
Connectivity
Canon EOS R3
Canon EOS 1D Mark III
HDMI Output Yes No
Microphone Port Yes No
Headphone Port Yes No
Wireless Yes
Built-in (802.11ac + Bluetooth)
Yes
Optional with WFT-E2 II
Remote Control Yes (via smartphone) Yes (N3 connector)
GPS Yes
Built-in
No
Body & Dimensions
Canon EOS R3
Canon EOS 1D Mark III
Enviromentally sealed Yes Yes
Battery Built-in Battery Pack
Battery Details LP-E19 lithium-ion battery & charger
Battery Pack LP-E4
Battery Life (CIPA) 760 shots 2200 shots
Width 150 mm 156 mm
Height 143 mm 157 mm
Depth 87 mm 80 mm
Weight 1015 gram 1155 gram