OM System
OM-5 Mark II
Updated compact MFT travel body with 20MP sensor, 7.5-stop IBIS, IP53 sealing, and Live ND.
$1,299
Launch priceReleased Jan 2025
OM System
PEN
First OM SYSTEM-branded PEN: compact rangefinder-style Micro Four Thirds body with 20.4MP Live MOS, 5-axis IBIS, built-in EVF, IPX1 sealing, and in-camera computational modes.
$1,000
Launch priceReleased Sep 2026
PEN is 1.6 years newer.
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Wins
OM-5 Mark II
Wins
PEN
10 categories tied
Which would you choose?
TL;DR — Key differences
- AOM-5 Mark II has higher RAW buffer depth (60 frames vs 29 frames)
- AOM-5 Mark II has higher 1080p max frame rate (120 fps vs 60 fps)
- AOM-5 Mark II has higher IBIS effectiveness (7.5 stops vs 5.5 stops)
- AOM-5 Mark II has higher EVF magnification (1.48 × vs 1.1 ×)
- BPEN has higher Battery life (CIPA) (410 shots vs 310 shots)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share
OM-5 Mark II
125 × 85 × 50 mm
414 g (0.91 lb / 14.60 oz)
Credit card
85.6 × 54 mm
for scale
PEN
126 × 75 × 43 mm
393 g (0.87 lb / 13.86 oz)
OM-5 Mark II is 1mm narrower than PEN but it is also 11mm taller and 6mm thicker.
OM-5 Mark II is 21 g heavier than PEN.
Depth (front-to-back): 50mm OM-5 Mark II · 43mm PEN
Back view, to scale
Width × Height — same proportions as the front of the body.
OM-5 Mark II
125 × 85 mm
Credit card
85.6 × 54 mm
PEN
126 × 75 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
OM-5 Mark II
125 × 50 mm
Credit card
85.6 × 54 mm
PEN
126 × 43 mm
Sensor size, to scale
OM-5 Mark II
17.4 × 13 mm · Compact / large-type
226 mm² area
PEN
17.4 × 13 mm · Compact / large-type
226 mm² area
Lens ecosystem
Native lens selection
OM-5 Mark II
✓ more lensesMicro Four Thirds
130+
native lenses available
PEN
✓ 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-5 Mark II
AF low-light limit
-7 EV vs -3.5 EV — lower is better
Dimensions (W×H×D mm)
Adds 125.3, 85.2, 49.7
Subject recognition
Adds Animal, Bird, Vehicle
RAW buffer depth
60 frames vs 29 frames — higher is better
1080p max frame rate
120 fps vs 60 fps — higher is better
Headphone jack (3.5mm)
Only OM-5 Mark II supports it
IBIS effectiveness
7.5 stops vs 5.5 stops — higher is better
EVF magnification
1.48 × vs 1.1 × — higher is better
Reasons to choose
PEN
Dimensions (W×H×D mm)
Adds 125.8, 74.5, 43.3
Subject recognition
Adds Dog, Cat
Codecs
Adds MOV
Battery life (CIPA)
410 shots vs 310 shots — higher is better
Weight
393 g vs 414 g — lower is better
Both cameras share
- ✓Resolution — Both 20.4 MP
- ✓ISO min (native) — Both 200
- ✓ISO max (native) — Both 25,600
- ✓AF points / zones — Both 121
- ✓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-5 Mark II
Pros
- ✓7.5-stop IBIS
- ✓IP53 weather sealing
- ✓Live ND & computational modes
- ✓Compact travel body
Cons
- –MFT sensor
- –Single card slot
- –Premium for MFT
PEN
Pros
- ✓393g rangefinder body with built-in 2.36M-dot EVF
- ✓First PEN with IPX1 dust/splash sealing
- ✓5-axis IBIS up to 5.5 stops + 121-point cross-type AF
- ✓Hi-Res, Live ND, Focus Stacking, HDR via CP button
- ✓4K / C4K video, vertical video, 3.5mm mic jack
Cons
- –Micro Four Thirds sensor vs APS-C/FF rivals
- –4K capped at 30p (C4K 24p only)
- –IPX1 is lighter sealing than OM-5 II / OM-3
- –Single SD slot, no headphone jack
Decided which one is right for you?
Compare live prices for the OM-5 Mark II and PEN at major authorized retailers.
OM System OM-5 Mark II
OM System PEN
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, OM-5 Mark II or PEN?
OM-5 Mark II scores 9.0/10 versus 5.5/10 for PEN — 30fps burst captures fleeting moments.
What's the resolution difference between the OM-5 Mark II and PEN?
Both cameras share the same 20.4 MP resolution.
Do the OM-5 Mark II and PEN have in-body image stabilization?
OM-5 Mark II has 7.5-stop in-body image stabilization, while PEN has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the OM-5 Mark II or the PEN?
OM-5 Mark II reaches 30 fps electronic. PEN reaches 30 fps electronic.
What's the weight difference between the OM-5 Mark II and PEN?
OM-5 Mark II weighs 414 g and PEN weighs 393 g, so the PEN is 21 g lighter.
Do the OM-5 Mark II and PEN record 4K video?
OM-5 Mark II: 4K up to 30p. PEN: 4K up to 30p.
Are the OM-5 Mark II and PEN weather sealed?
OM-5 Mark II: Yes. PEN: Yes.
Which has better battery life?
Rated battery life is 310 shots (CIPA) for the OM-5 Mark II and 410 shots for the PEN, giving the PEN the edge.
How much does each cost?
OM-5 Mark II launched at $1,299 and PEN at $1,000. The PEN is $299 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way OM-5 Mark II vs PEN vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed September 2026.
Product images courtesy of OM System press materials.