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
Launch priceReleased Nov 2025
Sony
Alpha 7S
12MP low-light video legend that changed indie filmmaking with incredible high ISO performance.
$2,499
Launch priceReleased Apr 2014
EOS R6 Mark III is 11.6 years newer.
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Wins
EOS R6 Mark III
Wins
Alpha 7S
5 categories tied
Which would you choose?
TL;DR — Key differences
- AEOS R6 Mark III has higher Max video bit rate (2600 Mbps vs 200 Mbps)
- AEOS R6 Mark III has higher Resolution (32.5 MP vs 12.2 MP)
- AEOS R6 Mark III has higher ISO max (native) (64,000 vs 25,600)
- AEOS R6 Mark III has higher Burst (electronic) (40 fps vs 20 fps)
- AEOS R6 Mark III has higher 4K max frame rate (120 fps vs 60 fps)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share
EOS R6 Mark III
138 × 98 × 88 mm
699 g (1.54 lb / 24.66 oz)
Credit card
85.6 × 54 mm
for scale
Alpha 7S
127 × 94 × 48 mm
489 g (1.08 lb / 17.25 oz)
EOS R6 Mark III is 12mm wider, 4mm taller, and 40mm thicker than Alpha 7S.
EOS R6 Mark III is 210 g heavier than Alpha 7S.
Depth (front-to-back): 88mm EOS R6 Mark III · 48mm Alpha 7S
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark III
138 × 98 mm
Credit card
85.6 × 54 mm
Alpha 7S
127 × 94 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
Credit card
85.6 × 54 mm
Alpha 7S
127 × 48 mm
Sensor size, to scale
EOS R6 Mark III
35.9 × 23.9 mm · Full Frame
858 mm² area
Alpha 7S
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 7S
✓ 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 -4 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 200 Mbps — higher is better
Resolution
32.5 MP vs 12.2 MP — higher is better
ISO max (native)
64,000 vs 25,600 — higher is better
Codecs
Adds CRM, XF-HEVC S, XF-AVC S
Burst (electronic)
40 fps vs 20 fps — higher is better
Reasons to choose
Alpha 7S
Subject recognition
Adds Human, Animal, Bird…
Dimensions (W×H×D mm)
Adds 126.9, 94.4, 48.2
Codecs
Adds ProRes
Weight
489 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
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓Internal RAW video — Both support internal raw video
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 7S
Pros
- ✓Legendary low light
- ✓12MP optimized for video
- ✓Full-frame
- ✓Historic video body
Cons
- –12MP for stills
- –No IBIS
- –Superseded by a7S series
Decided which one is right for you?
Compare live prices for the EOS R6 Mark III and Alpha 7S at major authorized retailers.
Canon EOS R6 Mark III
Sony Alpha 7S
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, EOS R6 Mark III or Alpha 7S?
Alpha 7S scores 9.0/10 versus 6.5/10 for EOS R6 Mark III — 20fps burst captures fleeting moments.
What's the resolution difference between the EOS R6 Mark III and Alpha 7S?
EOS R6 Mark III is 32.5 MP and Alpha 7S is 12.2 MP, so the EOS R6 Mark III captures more detail for cropping and large prints.
Do the EOS R6 Mark III and Alpha 7S have in-body image stabilization?
EOS R6 Mark III has 8.5-stop in-body image stabilization, while Alpha 7S has 7-stop in-body image stabilization.
Which shoots faster bursts — the EOS R6 Mark III or the Alpha 7S?
EOS R6 Mark III reaches 40 fps electronic. Alpha 7S reaches 20 fps electronic.
What's the weight difference between the EOS R6 Mark III and Alpha 7S?
EOS R6 Mark III weighs 699 g and Alpha 7S weighs 489 g, so the Alpha 7S is 210 g lighter.
Do the EOS R6 Mark III and Alpha 7S record 4K video?
EOS R6 Mark III: 4K up to 120p. Alpha 7S: 4K up to 60p.
Are the EOS R6 Mark III and Alpha 7S weather sealed?
EOS R6 Mark III: Yes. Alpha 7S: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the EOS R6 Mark III and 640 shots for the Alpha 7S, giving the Alpha 7S the edge.
How much does each cost?
EOS R6 Mark III launched at $2,799 and Alpha 7S at $2,499. The Alpha 7S is $300 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way EOS R6 Mark III vs Alpha 7S vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.
Product images courtesy of Canon and Sony press materials.