Sony
Alpha 9 III
Global shutter sports flagship with 120fps and zero rolling shutter for pro action.
$5,999
Launch priceReleased Jan 2024
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 9 III is 6.3 years newer.
Affiliate disclosure: As an Amazon Associate, Cameraegg earns from qualifying purchases. Cameraegg may also earn commission from B&H links, at no extra cost to you.
Wins
Alpha 9 III
Wins
RX10 IV
2 categories tied
Which would you choose?
TL;DR — Key differences
- BRX10 IV has higher Burst (mechanical) (24 fps vs 0 fps)
- AAlpha 9 III has higher Burst (electronic) (120 fps vs 15 fps)
- AAlpha 9 III has higher 4K max frame rate (120 fps vs 29.97 fps)
- AAlpha 9 III has higher Max video bit rate (600 Mbps vs 150 Mbps)
- AAlpha 9 III has higher EVF resolution (9,437,184 vs 2,359,296)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareAlpha 9 III
136 × 97 × 83 mm
703 g (1.55 lb / 24.80 oz)
Credit card
85.6 × 54 mm
for scale
RX10 IV
133 × 94 × 145 mm
1095 g (2.41 lb / 38.63 oz)
Alpha 9 III is 62mm thinner than RX10 IV but it is also 4mm wider and 3mm taller.
Alpha 9 III is 392 g lighter than RX10 IV.
Depth (front-to-back): 83mm Alpha 9 III · 145mm RX10 IV
Back view, to scale
Width × Height — same proportions as the front of the body.
Alpha 9 III
136 × 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 9 III
136 × 83 mm
Credit card
85.6 × 54 mm
RX10 IV
133 × 145 mm
Sensor size, to scale
Alpha 9 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 9 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 9 III
AF low-light limit
-5 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 136.1, 96.9, 82.9
Card types
Adds CFexpress Type A, SD UHS-II
Burst (electronic)
120 fps vs 15 fps — 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
Burst (mechanical)
24 fps vs 0 fps — higher is better
Dimensions (W×H×D mm)
Adds 132.5, 94, 145
Card types
Adds SD, SDHC, SDXC…
Codecs
Adds AVCHD, MP4
ISO min (native)
100 vs 250 — lower is better
Subject recognition
Adds Vehicle
RAW buffer depth
249 frames vs 200 frames — 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
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Alpha 9 III
Pros
- ✓Global shutter 120fps
- ✓Zero rolling shutter
- ✓Pro sports AF
- ✓Pre-capture buffer
Cons
- –24.6MP only
- –Premium price
- –Battery drain at max speed
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 9 III and RX10 IV at major authorized retailers.
Sony Alpha 9 III
Sony RX10 IV
Affiliate disclosure: As an Amazon Associate, Cameraegg earns from qualifying purchases. Cameraegg may also earn commission from B&H links, at no extra cost to you.
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, Alpha 9 III or RX10 IV?
Alpha 9 III scores 8.0/10 versus 3.0/10 for RX10 IV — 4K recording.
What's the resolution difference between the Alpha 9 III and RX10 IV?
Alpha 9 III is 24.6 MP and RX10 IV is 20.1 MP, so the Alpha 9 III captures more detail for cropping and large prints.
Do the Alpha 9 III and RX10 IV have in-body image stabilization?
Alpha 9 III has 8-stop in-body image stabilization, while RX10 IV has 6-stop in-body image stabilization.
Which shoots faster bursts — the Alpha 9 III or the RX10 IV?
Alpha 9 III reaches 120 fps electronic. RX10 IV reaches 24 fps mechanical.
What's the weight difference between the Alpha 9 III and RX10 IV?
Alpha 9 III weighs 703 g and RX10 IV weighs 1095 g, so the Alpha 9 III is 392 g lighter.
Do the Alpha 9 III and RX10 IV record 4K video?
Alpha 9 III: 4K up to 120p. RX10 IV: 4K up to 29.97p.
Are the Alpha 9 III and RX10 IV weather sealed?
Alpha 9 III: Yes. RX10 IV: Yes.
Which has better battery life?
Rated battery life is 400 shots (CIPA) for the Alpha 9 III and 370 shots for the RX10 IV, giving the Alpha 9 III the edge.
How much does each cost?
Alpha 9 III launched at $5,999 and RX10 IV at $1,699. The RX10 IV is $4,300 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way Alpha 9 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.