OM System
OM-1 II
Flagship MFT with stacked sensor, 120fps, and pro wildlife features.
$2,399
Launch priceReleased Feb 2024
Ricoh
GR IV
Latest GR with 25.74MP APS-C sensor, 28mm equivalent lens, 5-axis SR, 53GB internal memory, and pocket street-camera handling.
$1,499
Launch priceReleased Jan 2026
GR IV is 1.9 years newer.
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Wins
OM-1 II
Wins
GR IV
2 categories tied
Which would you choose?
TL;DR — Key differences
- AOM-1 II has higher Burst (electronic) (120 fps vs 4 fps)
- AOM-1 II has higher AF points / zones (1053 vs 49)
- AOM-1 II has higher 1080p max frame rate (240 fps vs 60 fps)
- AOM-1 II has higher Burst (mechanical) (10 fps vs 4 fps)
- BGR IV has lower Weight (262 g vs 599 g)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareOM-1 II
135 × 92 × 73 mm
599 g (1.32 lb / 21.13 oz)
Credit card
85.6 × 54 mm
for scale
GR IV
109 × 61 × 33 mm
262 g (0.58 lb / 9.24 oz)
OM-1 II is 25mm wider, 30mm taller, and 40mm thicker than GR IV.
OM-1 II is 337 g heavier than GR IV.
Depth (front-to-back): 73mm OM-1 II · 33mm GR IV
Back view, to scale
Width × Height — same proportions as the front of the body.
OM-1 II
135 × 92 mm
Credit card
85.6 × 54 mm
GR IV
109 × 61 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
OM-1 II
135 × 73 mm
Credit card
85.6 × 54 mm
GR IV
109 × 33 mm
Sensor size, to scale
OM-1 II
17.4 × 13 mm · Compact / large-type
226 mm² area
GR IV
23.3 × 15.5 mm · APS-C
361 mm² area
1.6× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
OM-1 II
✓ more lensesMicro Four Thirds
130+
native lenses available
GR 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
OM-1 II
Subject recognition
Adds People, Birds, Animals…
Dimensions (W×H×D mm)
Adds 134.8, 91.6, 72.7
Card types
Adds SD UHS-II, SD UHS-I
Burst (electronic)
120 fps vs 4 fps — higher is better
AF points / zones
1053 vs 49 — higher is better
1080p max frame rate
240 fps vs 60 fps — higher is better
Codecs
Adds H.264, H.265
Burst (mechanical)
10 fps vs 4 fps — higher is better
Reasons to choose
GR IV
Subject recognition
Adds Face, Eye
Dimensions (W×H×D mm)
Adds 109.4, 61.1, 32.7
Card types
Adds microSD, microSDHC, microSDXC UHS-I
Weight
262 g vs 599 g — lower is better
ISO max (native)
204,800 vs 102,400 — higher is better
Codecs
Adds MPEG-4 AVC/H.264
Resolution
25.74 MP vs 20.4 MP — higher is better
Both cameras share
- ✓Eye AF — Both support eye af
- ✓4K max frame rate — Both 60 fps
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
- ✓Card slots — Both 1
- ✓Touchscreen — Both support touchscreen
- ✓Wi-Fi — Both support wi-fi
Pros & cons at a glance
Editorially curated highlights and trade-offs.
OM-1 II
Pros
- ✓120fps stills
- ✓Stacked MFT
- ✓IP53 weather sealing
- ✓Computational features
Cons
- –MFT sensor size
- –Smaller ecosystem
- –Menu complexity
GR IV
Pros
- ✓25.74MP APS-C sensor
- ✓5-axis sensor-shift SR
- ✓53GB internal memory
- ✓Pocketable 28mm GR lens
Cons
- –Fixed lens
- –No built-in EVF
- –Full HD video only
Decided which one is right for you?
Compare live prices for the OM-1 II and GR IV at major authorized retailers.
OM System OM-1 II
Ricoh GR IV
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, OM-1 II or GR IV?
OM-1 II scores 10.0/10 versus 1.5/10 for GR IV — 120fps burst — pro-level action capture.
What's the resolution difference between the OM-1 II and GR IV?
OM-1 II is 20.4 MP and GR IV is 25.74 MP, so the GR IV captures more detail for cropping and large prints.
Do the OM-1 II and GR IV have in-body image stabilization?
OM-1 II has 8.5-stop in-body image stabilization, while GR IV has in-body image stabilization.
Which shoots faster bursts — the OM-1 II or the GR IV?
OM-1 II reaches 120 fps electronic. GR IV reaches 4 fps electronic.
What's the weight difference between the OM-1 II and GR IV?
OM-1 II weighs 599 g and GR IV weighs 262 g, so the GR IV is 337 g lighter.
Do the OM-1 II and GR IV record 4K video?
OM-1 II: 4K up to 60p. GR IV: 4K up to 60p.
Are the OM-1 II and GR IV weather sealed?
OM-1 II: Yes. GR IV: No.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the OM-1 II and 250 shots for the GR IV, giving the OM-1 II the edge.
How much does each cost?
OM-1 II launched at $2,399 and GR IV at $1,499. The GR IV is $900 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way OM-1 II vs GR IV vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed July 2026.
Product images courtesy of OM System and Ricoh press materials.