OM System
OM-3
Retro-styled MFT body with modern AF and creator-friendly design.
$1,699
Launch priceReleased Jan 2025
OM System
OM-D E-M5 Mark III
Compact pro MFT with IBIS and weather sealing.
$1,199
Launch priceReleased Oct 2019
OM-3 is 5.3 years newer.
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Wins
OM-3
Wins
OM-D E-M5 Mark III
7 categories tied
Which would you choose?
TL;DR — Key differences
- AOM-3 has higher Burst (electronic) (120 fps vs 15 fps)
- BOM-D E-M5 Mark III has lower ISO min (native) (100 vs 200)
- BOM-D E-M5 Mark III has higher Card slots (2 vs 1)
- AOM-3 has higher Burst (mechanical) (10 fps vs 6 fps)
- AOM-3 has higher EVF magnification (1.23 × vs 0.78 ×)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share
OM-3
139 × 89 × 46 mm
413 g (0.91 lb / 14.57 oz)
Credit card
85.6 × 54 mm
for scale
OM-D E-M5 Mark III
134 × 91 × 72 mm
580 g (1.28 lb / 20.46 oz)
OM-3 is 2mm shorter and 26mm thinner than OM-D E-M5 Mark III but it is also 5mm wider.
OM-3 is 167 g lighter than OM-D E-M5 Mark III.
Depth (front-to-back): 46mm OM-3 · 72mm OM-D E-M5 Mark III
Back view, to scale
Width × Height — same proportions as the front of the body.
OM-3
139 × 89 mm
Credit card
85.6 × 54 mm
OM-D E-M5 Mark III
134 × 91 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
OM-3
139 × 46 mm
Credit card
85.6 × 54 mm
OM-D E-M5 Mark III
134 × 72 mm
Sensor size, to scale
OM-3
17.4 × 13 mm · Compact / large-type
226 mm² area
OM-D E-M5 Mark III
17.3 × 13 mm · Micro Four Thirds
225 mm² area
Lens ecosystem
Native lens selection
OM-3
✓ more lensesMicro Four Thirds
130+
native lenses available
OM-D E-M5 Mark III
✓ more lensesMicro Four Thirds
130+
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-3
Subject recognition
Adds People, Birds, Animals…
Dimensions (W×H×D mm)
Adds 139.3, 88.9, 45.8
Card types
Adds SD, SDHC, SDXC
Burst (electronic)
120 fps vs 15 fps — higher is better
Codecs
Adds MOV, MPEG-4 AVC
Burst (mechanical)
10 fps vs 6 fps — higher is better
EVF magnification
1.23 × vs 0.78 × — higher is better
Weight
413 g vs 580 g — lower is better
Reasons to choose
OM-D E-M5 Mark III
AF low-light limit
-7 EV vs -5.5 EV — lower is better
Subject recognition
Adds Human, Animal, Bird…
Dimensions (W×H×D mm)
Adds 134, 91, 72
Card types
Adds SD UHS-II
AA filter
Only OM-D E-M5 Mark III supports it
ISO min (native)
100 vs 200 — lower is better
Card slots
2 vs 1 — higher is better
4K max frame rate
60 fps vs 59.94 fps — higher is better
Both cameras share
- ✓Resolution — Both 20.4 MP
- ✓ISO max (native) — Both 25,600
- ✓AF points / zones — Both 1053
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
Pros & cons at a glance
Editorially curated highlights and trade-offs.
OM-3
Pros
- ✓Retro design
- ✓Modern AF
- ✓Compact
Cons
- –MFT sensor
- –Premium for MFT
- –Smaller lens selection
OM-D E-M5 Mark III
Pros
- ✓Compact pro
- ✓Weather sealed
- ✓IBIS
Cons
- –Older
- –MFT
- –Superseded
Decided which one is right for you?
Compare live prices for the OM-3 and OM-D E-M5 Mark III at major authorized retailers.
OM System OM-3
OM System OM-D E-M5 Mark III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for video, OM-3 or OM-D E-M5 Mark III?
OM-D E-M5 Mark III scores 6.0/10 versus 3.5/10 for OM-3 — 4K recording.
What's the resolution difference between the OM-3 and OM-D E-M5 Mark III?
Both cameras share the same 20.4 MP resolution.
Do the OM-3 and OM-D E-M5 Mark III have in-body image stabilization?
OM-3 has 6.5-stop in-body image stabilization, while OM-D E-M5 Mark III has 6-stop in-body image stabilization.
Which shoots faster bursts — the OM-3 or the OM-D E-M5 Mark III?
OM-3 reaches 120 fps electronic. OM-D E-M5 Mark III reaches 15 fps electronic.
What's the weight difference between the OM-3 and OM-D E-M5 Mark III?
OM-3 weighs 413 g and OM-D E-M5 Mark III weighs 580 g, so the OM-3 is 167 g lighter.
Do the OM-3 and OM-D E-M5 Mark III record 4K video?
OM-3: 4K up to 59.94p. OM-D E-M5 Mark III: 4K up to 60p.
Are the OM-3 and OM-D E-M5 Mark III weather sealed?
OM-3: Yes. OM-D E-M5 Mark III: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the OM-3 and 640 shots for the OM-D E-M5 Mark III, giving the OM-D E-M5 Mark III the edge.
How much does each cost?
OM-3 launched at $1,699 and OM-D E-M5 Mark III at $1,199. The OM-D E-M5 Mark III is $500 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way OM-3 vs OM-D E-M5 Mark III vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed July 2026.
Product images courtesy of OM System press materials.