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
Released Sep 2022
Sony
Alpha 7 IV
33MP hybrid all-rounder with 10-bit 4K 60p and AI-powered subject tracking.
$2,499
Released Oct 2021
Osmo Action 3 is 11 months newer.
Wins
Osmo Action 3
Wins
Alpha 7 IV
1 categories tied
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TL;DR — Key differences
- BAlpha 7 IV has higher AF points / zones (759 vs 0)
- BAlpha 7 IV has higher RAW buffer depth (828 frames vs 60 frames)
- AOsmo Action 3 has lower Weight (145 g vs 658 g)
- BAlpha 7 IV has higher ISO max (native) (51,200 vs 12,800)
- BAlpha 7 IV has higher Max video bit rate (600 Mbps vs 200 Mbps)
Key specs at a glance
Size and weight, to scale
Osmo Action 3
71 × 44 × 33 mm
145 g (0.32 lb / 5.11 oz)
Alpha 7 IV
131 × 96 × 80 mm
658 g (1.45 lb / 23.21 oz)
Osmo Action 3 is 61mm narrower, 52mm shorter, and 47mm thinner than Alpha 7 IV.
Osmo Action 3 is 513 g lighter than Alpha 7 IV.
Depth (front-to-back): 33mm Osmo Action 3 · 80mm Alpha 7 IV
Sensor size, to scale
Alpha 7 IV
35.9 × 23.9 mm · Full Frame
858 mm² area
Lens ecosystem
Native lens selection
Osmo Action 3: mount data unavailable
Alpha 7 IV
✓ 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
Osmo Action 3
Dimensions (W×H×D mm)
Adds 70.5, 44.2, 32.8
Card types
Adds microSD
Weight
145 g vs 658 g — lower is better
Pre-Capture / Pre-Release
Only Osmo Action 3 supports it
4K max frame rate
120 fps vs 60 fps — higher is better
Codecs
Adds HEVC
Burst (electronic)
15 fps vs 10 fps — higher is better
Battery life (CIPA)
640 shots vs 580 shots — higher is better
Reasons to choose
Alpha 7 IV
AF points / zones
759 vs 0 — higher is better
Subject recognition
Adds Human, Animal, Bird…
Dimensions (W×H×D mm)
Adds 131.3, 96.4, 79.8
Card types
Adds CFexpress Type A, SD UHS-II
RAW buffer depth
828 frames vs 60 frames — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I…
ISO max (native)
51,200 vs 12,800 — higher is better
Max video bit rate
600 Mbps vs 200 Mbps — higher is better
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Weather sealing — Both support weather sealing
- ✓Touchscreen — Both support touchscreen
- ✓Wi-Fi — Both support wi-fi
- ✓Bluetooth — Both support bluetooth
Pros & cons at a glance
Editorially curated highlights and trade-offs.
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
Alpha 7 IV
Pros
- ✓33MP — more detail for cropping and print
- ✓10-bit 4K 60p (Super35 crop) / 4K 30p full-frame
- ✓Full-size HDMI port
- ✓759 phase-detect AF points
Cons
- –4K 60p requires Super35 crop
- –10fps burst lags behind R6 II at 40fps
- –Complex menu system
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for portraits, Osmo Action 3 or Alpha 7 IV?
Alpha 7 IV scores 9.0/10 versus 1.0/10 for Osmo Action 3 — 33MP — ample resolution for portraits.
What's the resolution difference between the Osmo Action 3 and Alpha 7 IV?
Osmo Action 3 is 12 MP and Alpha 7 IV is 33 MP, so the Alpha 7 IV captures more detail for cropping and large prints.
Do the Osmo Action 3 and Alpha 7 IV have in-body image stabilization?
Osmo Action 3 does not have IBIS, while alpha 7 IV has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the Osmo Action 3 or the Alpha 7 IV?
Osmo Action 3 reaches 15 fps electronic. Alpha 7 IV reaches 10 fps electronic.
What's the weight difference between the Osmo Action 3 and Alpha 7 IV?
Osmo Action 3 weighs 145 g and Alpha 7 IV weighs 658 g, so the Osmo Action 3 is 513 g lighter.
Do the Osmo Action 3 and Alpha 7 IV record 4K video?
Osmo Action 3: 4K up to 120p. Alpha 7 IV: 4K up to 60p.
Are the Osmo Action 3 and Alpha 7 IV weather sealed?
Osmo Action 3: Yes. Alpha 7 IV: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the Osmo Action 3 and 580 shots for the Alpha 7 IV, giving the Osmo Action 3 the edge.
How much does each cost?
Osmo Action 3 launched at $329 and Alpha 7 IV at $2,499. The Osmo Action 3 is $2,170 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of DJI and Sony press materials.