Canon
EOS C400
RF-mount Super 35 cinema camera with 6K 60p, Cinema RAW Light, and built-in 9-stop ND.
$7,999
Launch priceReleased Sep 2024
DJI
Osmo Action 3
Rugged 1/1.7-inch action camera with 4K 120p, dual touchscreens, RockSteady stabilization, and 16m waterproofing without a case.
$329
Launch priceReleased Sep 2022
EOS C400 is 2 years newer.
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Wins
EOS C400
Wins
Osmo Action 3
4 categories tied
Which would you choose?
TL;DR — Key differences
- AEOS C400 has higher AF points / zones (1053 vs 0)
- BOsmo Action 3 has lower Weight (145 g vs 1450 g)
- AEOS C400 has higher ISO max (native) (25,600 vs 12,800)
- AEOS C400 has higher RAW buffer depth (120 frames vs 60 frames)
- AEOS C400 has higher Card slots (2 vs 1)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareEOS C400
162 × 138 × 130 mm
1450 g (3.20 lb / 51.15 oz)
Credit card
85.6 × 54 mm
for scale
Osmo Action 3
71 × 44 × 33 mm
145 g (0.32 lb / 5.11 oz)
EOS C400 is 92mm wider, 94mm taller, and 97mm thicker than Osmo Action 3.
EOS C400 is 1305 g heavier than Osmo Action 3.
Depth (front-to-back): 130mm EOS C400 · 33mm Osmo Action 3
Sensor size, to scale
EOS C400
26.1 × 13.8 mm · APS-C
360 mm² area
Lens ecosystem
Native lens selection
EOS C400
✓ more lensesCanon RF
105+
native lenses available
Osmo Action 3: mount data unavailable
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 C400
AF points / zones
1053 vs 0 — higher is better
Subject recognition
Adds Human, Animal, Bird…
Codecs
Adds Cinema RAW Light, XF-AVC, Apple ProRes
Dimensions (W×H×D mm)
Adds 162, 138, 130
Card types
Adds SD UHS-II
ISO max (native)
25,600 vs 12,800 — higher is better
Eye AF
Only EOS C400 supports it
Animal / bird AF
Only EOS C400 supports it
Reasons to choose
Osmo Action 3
Codecs
Adds H.264, HEVC
Stabilization modes
Adds RockSteady, HorizonBalancing, HorizonSteady
Dimensions (W×H×D mm)
Adds 70.5, 44.2, 32.8
Card types
Adds microSD
Weight
145 g vs 1450 g — lower is better
Resolution
12 MP vs 6.2 MP — higher is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓4K max frame rate — Both 120 fps
- ✓Max video bit rate — Both 200 Mbps
- ✓Weather sealing — Both support weather sealing
- ✓Battery life (CIPA) — Both 640 shots
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS C400
Pros
- ✓6K 60p internal
- ✓Built-in 9-stop ND
- ✓Dual gain sensor
- ✓RF mount
Cons
- –Super 35 only
- –Premium price
- –Large media needs
Osmo Action 3
Pros
- ✓4K 120p
- ✓Dual touchscreens
- ✓16m waterproof without case
- ✓RockSteady and HorizonSteady
Cons
- –Older than Action 4/5 Pro
- –Small action-cam sensor
- –Fixed ultra-wide lens
Decided which one is right for you?
Compare live prices for the EOS C400 and Osmo Action 3 at major authorized retailers.
Canon EOS C400
DJI Osmo Action 3
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, EOS C400 or Osmo Action 3?
EOS C400 scores 9.0/10 versus 4.5/10 for Osmo Action 3 — 6K video for oversampled 4K.
What's the resolution difference between the EOS C400 and Osmo Action 3?
EOS C400 is 6.2 MP and Osmo Action 3 is 12 MP, so the Osmo Action 3 captures more detail for cropping and large prints.
Do the EOS C400 and Osmo Action 3 have in-body image stabilization?
EOS C400 has 7-stop in-body image stabilization, while Osmo Action 3 uses Electronic image stabilization (electronic).
Which shoots faster bursts — the EOS C400 or the Osmo Action 3?
EOS C400 reaches 20 fps electronic. Osmo Action 3 reaches 15 fps electronic.
What's the weight difference between the EOS C400 and Osmo Action 3?
EOS C400 weighs 1450 g and Osmo Action 3 weighs 145 g, so the Osmo Action 3 is 1305 g lighter.
Do the EOS C400 and Osmo Action 3 record 4K video?
EOS C400: 6K 60p (max), 4K up to 120p. Osmo Action 3: 4K up to 120p.
Are the EOS C400 and Osmo Action 3 weather sealed?
EOS C400: Yes. Osmo Action 3: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the EOS C400 and 640 shots for the Osmo Action 3, giving the Osmo Action 3 the edge.
How much does each cost?
EOS C400 launched at $7,999 and Osmo Action 3 at $329. The Osmo Action 3 is $7,670 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way EOS C400 vs Osmo Action 3 vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.