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
Sony
Alpha 7 III
Classic 24MP hybrid that defined the modern full-frame value proposition.
$1,999
Released Feb 2018
EOS R6 Mark III is 7.7 years newer.
Wins
EOS R6 Mark III
Wins
Alpha 7 III
3 categories tied
TL;DR — Key differences
- AEOS R6 Mark III has higher Max video bit rate (2600 Mbps vs 100 Mbps)
- AEOS R6 Mark III has higher Burst (electronic) (40 fps vs 10 fps)
- AEOS R6 Mark III has higher 4K max frame rate (120 fps vs 30 fps)
- AEOS R6 Mark III has higher IBIS effectiveness (8.5 stops vs 5 stops)
- AEOS R6 Mark III has higher RAW buffer depth (150 frames vs 89 frames)
Key specs at a glance
Size and weight, to scale
EOS R6 Mark III
138 × 98 × 88 mm
699 g (1.54 lb / 24.66 oz)
Alpha 7 III
127 × 96 × 74 mm
650 g (1.43 lb / 22.93 oz)
EOS R6 Mark III is 12mm wider, 3mm taller, and 15mm thicker than Alpha 7 III.
EOS R6 Mark III is 49 g heavier than Alpha 7 III.
Depth (front-to-back): 88mm EOS R6 Mark III · 74mm Alpha 7 III
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark III
138 × 98 mm
Alpha 7 III
127 × 96 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R6 Mark III
138 × 88 mm
Alpha 7 III
127 × 74 mm
Sensor size, to scale
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
Alpha 7 III
35.6 × 23.8 mm · Full Frame
847 mm² area
Lens ecosystem
Native lens selection
EOS R6 Mark III
Canon RF
105+
native lenses available
Alpha 7 III
✓ more lensesSony E
350+
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 R6 Mark III
AF low-light limit
-6.5 EV vs -3 EV — lower is better
Subject recognition
Adds People, Dogs, Cats…
Dimensions (W×H×D mm)
Adds 138.4, 98.4, 88.4
Max video bit rate
2600 Mbps vs 100 Mbps — higher is better
Codecs
Adds CRM, XF-HEVC S, XF-AVC S…
Burst (electronic)
40 fps vs 10 fps — higher is better
4K max frame rate
120 fps vs 30 fps — higher is better
Pre-Capture / Pre-Release
Only EOS R6 Mark III supports it
Reasons to choose
Alpha 7 III
Subject recognition
Adds Human, Animal
Dimensions (W×H×D mm)
Adds 126.9, 95.6, 73.7
Codecs
Adds XAVC S, AVCHD
Card types
Adds SD UHS-I
Battery life (CIPA)
710 shots vs 640 shots — higher is better
Weight
650 g vs 699 g — lower is better
EVF magnification
0.78 × vs 0.76 × — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓In-body stabilization — Both support in-body stabilization
- ✓Weather sealing — Both support weather sealing
Pros & cons at a glance
Editorially curated highlights and trade-offs.
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
Alpha 7 III
Pros
- ✓Proven reliability
- ✓Great battery life
- ✓Strong value used
- ✓Dual card slots
Cons
- –Older AF vs newer bodies
- –4K 30p only
- –No 10-bit internal
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, EOS R6 Mark III or Alpha 7 III?
EOS R6 Mark III scores 8.5/10 versus 4.0/10 for Alpha 7 III — 40fps burst — pro-level action capture.
What's the resolution difference between the EOS R6 Mark III and Alpha 7 III?
EOS R6 Mark III is 32.5 MP and Alpha 7 III is 24.2 MP, so the EOS R6 Mark III captures more detail for cropping and large prints.
Do the EOS R6 Mark III and Alpha 7 III have in-body image stabilization?
EOS R6 Mark III has 8.5-stop in-body image stabilization, while alpha 7 III has 5-stop in-body image stabilization.
Which shoots faster bursts — the EOS R6 Mark III or the Alpha 7 III?
EOS R6 Mark III reaches 40 fps electronic. Alpha 7 III reaches 10 fps electronic.
What's the weight difference between the EOS R6 Mark III and Alpha 7 III?
EOS R6 Mark III weighs 699 g and Alpha 7 III weighs 650 g, so the Alpha 7 III is 49 g lighter.
Do the EOS R6 Mark III and Alpha 7 III record 4K video?
EOS R6 Mark III: 4K up to 120p. Alpha 7 III: 4K up to 30p.
Are the EOS R6 Mark III and Alpha 7 III weather sealed?
EOS R6 Mark III: Yes. Alpha 7 III: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the EOS R6 Mark III and 710 shots for the Alpha 7 III, giving the Alpha 7 III the edge.
How much does each cost?
EOS R6 Mark III launched at $2,799 and Alpha 7 III at $1,999. The Alpha 7 III is $800 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and Sony press materials.