Canon
EOS R3
Pro 24MP full-frame stacked-sensor body built for sports, news, wildlife, and high-speed hybrid capture.
$5,999
Released Sep 2021
Canon
EOS R6 Mark III
Hybrid 32.5MP full-frame RF body with 7K RAW video, 40fps electronic burst, 8.5-stop IBIS, and Dual Pixel CMOS AF II.
$2,799
Released Nov 2025
EOS R6 Mark III is 4.2 years newer.
Wins
EOS R3
Wins
EOS R6 Mark III
10 categories tied
TL;DR — Key differences
- AEOS R3 has higher ISO max (native) (102,400 vs 64,000)
- AEOS R3 has higher EVF resolution (5,760,000 vs 3,690,000)
- BEOS R6 Mark III has lower Weight (699 g vs 1015 g)
- BEOS R6 Mark III has higher Resolution (32.5 MP vs 24.1 MP)
- BEOS R6 Mark III has higher Burst (electronic) (40 fps vs 30 fps)
Key specs at a glance
Size and weight, to scale
EOS R3
150 × 143 × 87 mm
1015 g (2.24 lb / 35.80 oz)
EOS R6 Mark III
138 × 98 × 88 mm
699 g (1.54 lb / 24.66 oz)
EOS R3 is 1mm thinner than EOS R6 Mark III but it is also 12mm wider and 44mm taller.
EOS R3 is 316 g heavier than EOS R6 Mark III.
Depth (front-to-back): 87mm EOS R3 · 88mm EOS R6 Mark III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R3
150 × 143 mm
EOS R6 Mark III
138 × 98 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R3
150 × 87 mm
EOS R6 Mark III
138 × 88 mm
Sensor size, to scale
EOS R3
36 × 24 mm · Full Frame
864 mm² area
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
Lens ecosystem
Native lens selection
EOS R3
✓ more lensesCanon RF
105+
native lenses available
EOS R6 Mark III
✓ more lensesCanon RF
105+
native lenses available
Counts include current first-party and major third-party native autofocus lenses.
Use-case scoring
Which one for what?
Algorithmic scores from verified specs · 10 = best in class
Why pick one over the other
Reasons to choose
EOS R3
AF low-light limit
-7.5 EV vs -6.5 EV — lower is better
Dimensions (W×H×D mm)
Adds 150, 142.6, 87.2
ISO max (native)
102,400 vs 64,000 — higher is better
EVF resolution
5,760,000 vs 3,690,000 — higher is better
Codecs
Adds RAW
Subject recognition
Adds Motorsport vehicles
Reasons to choose
EOS R6 Mark III
Dimensions (W×H×D mm)
Adds 138.4, 98.4, 88.4
Codecs
Adds CRM, XF-HEVC S, XF-AVC S
Subject recognition
Adds Horses, Cars, Motorbikes…
Pre-Capture / Pre-Release
Only EOS R6 Mark III supports it
Weight
699 g vs 1015 g — lower is better
Resolution
32.5 MP vs 24.1 MP — higher is better
Burst (electronic)
40 fps vs 30 fps — higher is better
IBIS effectiveness
8.5 stops vs 8 stops — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — Both 100
- ✓AF points / zones — Both 1053
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS R3
Pros
- ✓30fps electronic burst from a stacked full-frame sensor
- ✓Exceptional low-light AF down to -7.5 EV
- ✓Integrated pro body with large LP-E19 battery
- ✓6K RAW video and 4K 120p
- ✓Rugged weather-sealed construction
Cons
- –24MP resolution trails higher-detail rivals
- –Large integrated-grip body
- –Expensive compared with enthusiast full-frame bodies
EOS R6 Mark III
Pros
- ✓32.5MP full-frame sensor
- ✓7K RAW video & 4K 120p
- ✓40fps electronic burst with Pre-Continuous
- ✓8.5-stop IBIS
Cons
- –Single CFexpress Type B + SD slot
- –Smaller LCD than R5 II
- –LP-E6P required for full features
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, EOS R3 or EOS R6 Mark III?
EOS R3 scores 9.0/10 versus 6.5/10 for EOS R6 Mark III — 6K video for oversampled 4K.
What's the resolution difference between the EOS R3 and EOS R6 Mark III?
EOS R3 is 24.1 MP and EOS R6 Mark III is 32.5 MP, so the EOS R6 Mark III captures more detail for cropping and large prints.
Do the EOS R3 and EOS R6 Mark III have in-body image stabilization?
EOS R3 has 8-stop in-body image stabilization, while eOS R6 Mark III has 8.5-stop in-body image stabilization.
Which shoots faster bursts — the EOS R3 or the EOS R6 Mark III?
EOS R3 reaches 30 fps electronic. EOS R6 Mark III reaches 40 fps electronic.
What's the weight difference between the EOS R3 and EOS R6 Mark III?
EOS R3 weighs 1015 g and EOS R6 Mark III weighs 699 g, so the EOS R6 Mark III is 316 g lighter.
Do the EOS R3 and EOS R6 Mark III record 4K video?
EOS R3: 6K RAW (max), 4K up to 120p. EOS R6 Mark III: 4K up to 120p.
Are the EOS R3 and EOS R6 Mark III weather sealed?
EOS R3: Yes. EOS R6 Mark III: Yes.
Which has better battery life?
Rated battery life is 620 shots (CIPA) for the EOS R3 and 640 shots for the EOS R6 Mark III, giving the EOS R6 Mark III the edge.
How much does each cost?
EOS R3 launched at $5,999 and EOS R6 Mark III at $2,799. The EOS R6 Mark III is $3,200 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon press materials.