OM System
OM-1
First OM System flagship with cross-type AF and 50fps burst.
$2,199
Launch priceReleased Feb 2022
Sony
Alpha 9 III
Global shutter sports flagship with 120fps and zero rolling shutter for pro action.
$5,999
Launch priceReleased Jan 2024
Alpha 9 III is 1.9 years newer.
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Wins
OM-1
Wins
Alpha 9 III
2 categories tied
Which would you choose?
TL;DR — Key differences
- AOM-1 has higher Burst (mechanical) (10 fps vs 0 fps)
- AOM-1 has higher ISO max (native) (102,400 vs 25,600)
- BAlpha 9 III has higher Max video bit rate (600 Mbps vs 150 Mbps)
- AOM-1 has lower ISO min (native) (80 vs 250)
- BAlpha 9 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 shareOM-1
135 × 92 × 73 mm
599 g (1.32 lb / 21.13 oz)
Credit card
85.6 × 54 mm
for scale
Alpha 9 III
136 × 97 × 83 mm
703 g (1.55 lb / 24.80 oz)
OM-1 is 1mm narrower, 5mm shorter, and 10mm thinner than Alpha 9 III.
OM-1 is 104 g lighter than Alpha 9 III.
Depth (front-to-back): 73mm OM-1 · 83mm Alpha 9 III
Sensor size, to scale
OM-1
17.4 × 13 mm · Compact / large-type
226 mm² area
Alpha 9 III
35.6 × 23.8 mm · Full Frame
847 mm² area
3.7× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
OM-1
Micro Four Thirds
130+
native lenses available
Alpha 9 III
✓ 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
OM-1
AF low-light limit
-8 EV vs -5 EV — lower is better
Subject recognition
Adds People, Birds, Animals…
Burst (mechanical)
10 fps vs 0 fps — higher is better
Dimensions (W×H×D mm)
Adds 134.8, 91.6, 72.7
ISO max (native)
102,400 vs 25,600 — higher is better
ISO min (native)
80 vs 250 — lower is better
Card types
Adds SD UHS-I
Codecs
Adds MOV
Reasons to choose
Alpha 9 III
Subject recognition
Adds Human, Animal, Bird…
Dimensions (W×H×D mm)
Adds 136.1, 96.9, 82.9
Max video bit rate
600 Mbps vs 150 Mbps — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
AA filter
Only Alpha 9 III supports it
4K max frame rate
120 fps vs 60 fps — higher is better
Internal RAW video
Only Alpha 9 III supports it
Card slots
2 vs 1 — higher is better
Both cameras share
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Burst (electronic) — Both 120 fps
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
- ✓IBIS effectiveness — Both 8 stops
Pros & cons at a glance
Editorially curated highlights and trade-offs.
OM-1
Pros
- ✓50fps burst
- ✓Great weather sealing
- ✓Computational modes
Cons
- –MFT sensor
- –Superseded by OM-1 II
- –Smaller than FF
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
Decided which one is right for you?
Compare live prices for the OM-1 and Alpha 9 III at major authorized retailers.
OM System OM-1
Sony Alpha 9 III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for landscape, OM-1 or Alpha 9 III?
Alpha 9 III scores 7.0/10 versus 2.5/10 for OM-1 — Full-frame sensor — wider dynamic range.
What's the resolution difference between the OM-1 and Alpha 9 III?
OM-1 is 20.4 MP and Alpha 9 III is 24.6 MP, so the Alpha 9 III captures more detail for cropping and large prints.
Do the OM-1 and Alpha 9 III have in-body image stabilization?
OM-1 has 8-stop in-body image stabilization, while Alpha 9 III has 8-stop in-body image stabilization.
Which shoots faster bursts — the OM-1 or the Alpha 9 III?
OM-1 reaches 120 fps electronic. Alpha 9 III reaches 120 fps electronic.
What's the weight difference between the OM-1 and Alpha 9 III?
OM-1 weighs 599 g and Alpha 9 III weighs 703 g, so the OM-1 is 104 g lighter.
Do the OM-1 and Alpha 9 III record 4K video?
OM-1: 4K up to 60p. Alpha 9 III: 4K up to 120p.
Are the OM-1 and Alpha 9 III weather sealed?
OM-1: Yes. Alpha 9 III: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the OM-1 and 400 shots for the Alpha 9 III, giving the OM-1 the edge.
How much does each cost?
OM-1 launched at $2,199 and Alpha 9 III at $5,999. The OM-1 is $3,800 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way OM-1 vs Alpha 9 III vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.