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 priceAffiliate disclosure: As an Amazon Associate, Cameraegg earns from qualifying purchases. Cameraegg may also earn commission from B&H links, at no extra cost to you.
Last updated September 2026
Key specs at a glance
Resolution
20.4 MP
Sensor
MFT
ISO max
25,600
Burst
30 fps
4K
30 fps
IBIS
5.5-stop
Weight
393 g
Battery
410 shots
Where to buy the OM System PEN
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Sensor size
OM System PEN
17.4 × 13 mm · Compact / large-type
226 mm² area
Lens ecosystem
Micro Four Thirds mount
60
First-party
70
Third-party
130+
Total available
Mount introduced 2008
Body size, to scale
Front view
Width × Height
Credit card
85.6 × 54 mm
Back view
Width × Height — same proportions as the front
Credit card
85.6 × 54 mm
Top view
Width × Depth (front-to-back)
Credit card
85.6 × 54 mm
126 × 75 × 43 mm · 393 g (0.87 lb / 13.86 oz)
Product images courtesy of OM System press materials.
Best for
Use-case scores
Scored algorithmically from verified specs. 10 = best in class.
Portrait
Fair- · Eye AF locks focus on subjects reliably
- · In-body stabilization for handheld shooting
Sports & Action
Good- · 30fps burst — pro-level action capture
- · Pre-Capture records before you press shutter
Video & Hybrid
Limited- · Log profile (OM-Log400 / OM-Cinema1 / OM-Cinema2 / Flat) for grading latitude
- · IBIS smooths handheld video
Landscape
Limited- · Weather sealed for outdoor conditions
- · IBIS enables slower handheld shutter speeds
Travel
Good- · 393g — ultralight for all-day carry
- · Weather sealed for varied conditions
Wildlife
Fair- · 30fps burst captures fleeting moments
- · Weather sealed for field conditions
Vlogging
Good- · 393g — easy to handhold for selfie video
- · IBIS reduces handheld shake
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
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Full specifications
Verified specs · OM System PEN