OM System
OM-1
First OM System flagship with cross-type AF and 50fps burst.
$2,199
Released Feb 2022
Sony
Alpha 7 IV
33MP hybrid all-rounder with 10-bit 4K 60p and AI-powered subject tracking.
$2,499
Released Oct 2021
OM-1 is 4 months newer.
Wins
OM-1
Wins
Alpha 7 IV
4 categories tied
TL;DR — Key differences
- AOM-1 has higher Burst (electronic) (120 fps vs 10 fps)
- BAlpha 7 IV has higher Max video bit rate (600 Mbps vs 150 Mbps)
- AOM-1 has higher ISO max (native) (102,400 vs 51,200)
- BAlpha 7 IV has higher Card slots (2 vs 1)
- BAlpha 7 IV has higher Resolution (33 MP vs 20.4 MP)
Key specs at a glance
Size and weight, to scale
OM-1
135 × 92 × 73 mm
599 g (1.32 lb / 21.13 oz)
Alpha 7 IV
131 × 96 × 80 mm
658 g (1.45 lb / 23.21 oz)
OM-1 is 5mm shorter and 7mm thinner than Alpha 7 IV but it is also 4mm wider.
OM-1 is 59 g lighter than Alpha 7 IV.
Depth (front-to-back): 73mm OM-1 · 80mm Alpha 7 IV
Sensor size, to scale
OM-1
17.4 × 13 mm · Compact / large-type
226 mm² area
Alpha 7 IV
35.9 × 23.9 mm · Full Frame
858 mm² area
3.8× 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 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
OM-1
AF low-light limit
-8 EV vs -4 EV — lower is better
Subject recognition
Adds People, Birds, Animals…
Dimensions (W×H×D mm)
Adds 134.8, 91.6, 72.7
Burst (electronic)
120 fps vs 10 fps — higher is better
ISO max (native)
102,400 vs 51,200 — higher is better
Pre-Capture / Pre-Release
Only OM-1 supports it
Card types
Adds SD UHS-I
EVF resolution
5,760,000 vs 3,686,400 — higher is better
Reasons to choose
Alpha 7 IV
Subject recognition
Adds Human, Animal, Bird…
Dimensions (W×H×D mm)
Adds 131.3, 96.4, 79.8
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 7 IV supports it
Internal RAW video
Only Alpha 7 IV supports it
Card slots
2 vs 1 — higher is better
Card types
Adds CFexpress Type A
Both cameras share
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Burst (mechanical) — Both 10 fps
- ✓4K max frame rate — Both 60 fps
- ✓In-body stabilization — Both support in-body stabilization
- ✓Weather sealing — Both support weather sealing
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 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, OM-1 or Alpha 7 IV?
Alpha 7 IV scores 9.0/10 versus 4.0/10 for OM-1 — 33MP — ample resolution for portraits.
What's the resolution difference between the OM-1 and Alpha 7 IV?
OM-1 is 20.4 MP and Alpha 7 IV is 33 MP, so the Alpha 7 IV captures more detail for cropping and large prints.
Do the OM-1 and Alpha 7 IV have in-body image stabilization?
OM-1 has 8-stop in-body image stabilization, while alpha 7 IV has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the OM-1 or the Alpha 7 IV?
OM-1 reaches 120 fps electronic. Alpha 7 IV reaches 10 fps electronic.
What's the weight difference between the OM-1 and Alpha 7 IV?
OM-1 weighs 599 g and Alpha 7 IV weighs 658 g, so the OM-1 is 59 g lighter.
Do the OM-1 and Alpha 7 IV record 4K video?
OM-1: 4K up to 60p. Alpha 7 IV: 4K up to 60p.
Are the OM-1 and Alpha 7 IV weather sealed?
OM-1: Yes. Alpha 7 IV: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the OM-1 and 580 shots for the Alpha 7 IV, giving the Alpha 7 IV the edge.
How much does each cost?
OM-1 launched at $2,199 and Alpha 7 IV at $2,499. The OM-1 is $300 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of OM System and Sony press materials.