Sony
Alpha 7S III
12MP low-light video specialist with 4K 120p, 16-bit RAW HDMI, and excellent autofocus.
$3,499
Launch priceReleased Sep 2020
Sony
RX10 IV
1-inch bridge with 24–600mm f/2.4–4 zoom, 24fps AF tracking, and pro video features.
$1,699
Launch priceReleased Sep 2017
Alpha 7S III is 3 years newer.
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Wins
Alpha 7S III
Wins
RX10 IV
2 categories tied
Which would you choose?
TL;DR — Key differences
- AAlpha 7S III has higher ISO max (native) (102,400 vs 12,800)
- AAlpha 7S III has higher 4K max frame rate (120 fps vs 29.97 fps)
- AAlpha 7S III has higher Max video bit rate (600 Mbps vs 150 Mbps)
- AAlpha 7S III has higher EVF resolution (9,437,184 vs 2,359,296)
- BRX10 IV has higher Burst (mechanical) (24 fps vs 10 fps)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareAlpha 7S III
129 × 97 × 81 mm
699 g (1.54 lb / 24.66 oz)
Credit card
85.6 × 54 mm
for scale
RX10 IV
133 × 94 × 145 mm
1095 g (2.41 lb / 38.63 oz)
Alpha 7S III is 4mm narrower and 64mm thinner than RX10 IV but it is also 3mm taller.
Alpha 7S III is 396 g lighter than RX10 IV.
Depth (front-to-back): 81mm Alpha 7S III · 145mm RX10 IV
Back view, to scale
Width × Height — same proportions as the front of the body.
Alpha 7S III
129 × 97 mm
Credit card
85.6 × 54 mm
RX10 IV
133 × 94 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
Alpha 7S III
129 × 81 mm
Credit card
85.6 × 54 mm
RX10 IV
133 × 145 mm
Sensor size, to scale
Alpha 7S III
35.6 × 23.8 mm · Full Frame
847 mm² area
RX10 IV
13.2 × 8.8 mm · 1-inch
116 mm² area
7.3× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
Alpha 7S III
✓ more lensesSony E
350+
native lenses available
RX10 IV: 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
Alpha 7S III
AF low-light limit
-6 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 128.9, 96.9, 80.8
Card types
Adds CFexpress Type A, SD UHS-II
ISO max (native)
102,400 vs 12,800 — higher is better
Codecs
Adds XAVC HS, XAVC S-I, H.265…
4K max frame rate
120 fps vs 29.97 fps — higher is better
Max video bit rate
600 Mbps vs 150 Mbps — higher is better
EVF resolution
9,437,184 vs 2,359,296 — higher is better
Reasons to choose
RX10 IV
Dimensions (W×H×D mm)
Adds 132.5, 94, 145
Card types
Adds SD, SDHC, SDXC…
Codecs
Adds AVCHD, MP4
Burst (mechanical)
24 fps vs 10 fps — higher is better
RAW buffer depth
249 frames vs 120 frames — higher is better
Subject recognition
Adds Bird, Vehicle
Pre-Capture / Pre-Release
Only RX10 IV supports it
Resolution
20.1 MP vs 12.1 MP — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓AF points / zones — Both 759
- ✓AF frame coverage — Both 94 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Alpha 7S III
Pros
- ✓Best-in-class low light
- ✓4K 120p
- ✓Full-size HDMI
- ✓Strong IBIS
Cons
- –12MP stills limit
- –Older generation now
- –No 8K
RX10 IV
Pros
- ✓24–600mm reach
- ✓24fps with AF
- ✓Weather sealed
- ✓Strong all-in-one travel camera
Cons
- –1-inch sensor
- –Large bridge body
- –Expensive for sensor size
Decided which one is right for you?
Compare live prices for the Alpha 7S III and RX10 IV at major authorized retailers.
Sony Alpha 7S III
Sony RX10 IV
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, Alpha 7S III or RX10 IV?
Alpha 7S III scores 8.0/10 versus 3.0/10 for RX10 IV — 4K recording.
What's the resolution difference between the Alpha 7S III and RX10 IV?
Alpha 7S III is 12.1 MP and RX10 IV is 20.1 MP, so the RX10 IV captures more detail for cropping and large prints.
Do the Alpha 7S III and RX10 IV have in-body image stabilization?
Alpha 7S III has 5.5-stop in-body image stabilization, while RX10 IV has 6-stop in-body image stabilization.
Which shoots faster bursts — the Alpha 7S III or the RX10 IV?
Alpha 7S III reaches 10 fps electronic. RX10 IV reaches 24 fps mechanical.
What's the weight difference between the Alpha 7S III and RX10 IV?
Alpha 7S III weighs 699 g and RX10 IV weighs 1095 g, so the Alpha 7S III is 396 g lighter.
Do the Alpha 7S III and RX10 IV record 4K video?
Alpha 7S III: 4K up to 120p. RX10 IV: 4K up to 29.97p.
Are the Alpha 7S III and RX10 IV weather sealed?
Alpha 7S III: Yes. RX10 IV: Yes.
Which has better battery life?
Rated battery life is 600 shots (CIPA) for the Alpha 7S III and 370 shots for the RX10 IV, giving the Alpha 7S III the edge.
How much does each cost?
Alpha 7S III launched at $3,499 and RX10 IV at $1,699. The RX10 IV is $1,800 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way Alpha 7S III vs RX10 IV vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed July 2026.
Product images courtesy of Sony press materials.