The catch
OM SYSTEM OM-5 Mark II body
USB power only slows the drain, and it stops helping once the internal battery is empty. Tracking Pro Capture does not work with MFT lenses from other manufacturers.
Side by side
OM SYSTEM OM-5 Mark II vs OM-3: OM-5 II is lighter to travel with, OM-3 alters the power and pre-capture setup
Quick verdict
The OM-5 II is 78g lighter, and the OM-3 accepts specified USB PD power and has a longer pre-capture buffer. Take the OM-5 II for a lighter stills bag if its compatible lenses and your battery routine are enough. Take the OM-3 for its separate headphone output, a qualified USB PD setup or broader pre-capture options. Neither offer includes a lens. Neither camera makes a second card copy, and the fastest burst figures do not describe continuous focus with every lens.
Before you buy
Why, and what it costs you
Behind the same USB-C plug are two different power-bank routines
Say the camera finishes a walk and then becomes a desk recording rig. The OM-3 takes a suitable USB PD source rated at least 27W with the specified voltage profiles. The OM-5 II takes 5V1.5A only to slow battery drain, and it still shuts off when the internal battery runs out. A more powerful bank does not change that. Both need a battery that is adequately charged, and neither arrangement gets around heat or card limits. Once you are back outdoors, close the covers again before counting on the rated weather-resistant setup. What matters is how the whole power arrangement works. Both sockets being USB-C does not settle it.
Where this comes from
Based on the official supply requirements and weather precautions. No claim of uninterrupted runtime or powered use in rain.
The catch
OM SYSTEM OM-3 body
It weighs 78g more, moves to BLX-1 batteries and has no wired remote input. It still has just one card slot, which remains a limitation.
OM SYSTEM OM-5 Mark II body
- Why pick it
- On long outings you take the same compatible lens and like the body being 78g lighter.
- Your BLS-50 spares and supported close-up lenses already cover the photographs you take.
- The catch
- USB power only slows the drain, and it stops helping once the internal battery is empty. Tracking Pro Capture does not work with MFT lenses from other manufacturers.
OM SYSTEM OM-3 body
- Why pick it
- You want separate headphone monitoring, plus a camera that takes the specified 27W-or-greater USB PD source.
- A longer pre-shutter window is what you need, once you have checked the exact lens and focus mode.
- The catch
- It weighs 78g more, moves to BLX-1 batteries and has no wired remote input. It still has just one card slot, which remains a limitation.
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What this page compares
OM-5 Mark II vs OM-3 for walking, pets and close-up hobbies. Weigh pre-capture that depends on the lens, power-bank behavior and the real limits of in-camera stacking.
Both are small MFT cameras aimed at outdoor use, each with one card and computational stills. To decide whether the larger body is worth carrying and paying for, you need to know what changes in power, lenses and capture.
Which one fits
Pick the situations that sound like you
Walk with the same lens in a lighter kit
OM-5 II saves 78g.
- OM SYSTEM OM-5 Mark II body
- Better fit
- OM SYSTEM OM-3 body
- Good
Keep using the wired remote release you have
Wired remote control is not supported on the OM-3.
- OM SYSTEM OM-5 Mark II body
- Better fit
- OM SYSTEM OM-3 body
- Not suitable
Run a home setup on the specified USB PD source
All the OM-5 II does is cut internal-battery drain.
- OM SYSTEM OM-5 Mark II body
- Caution
- OM SYSTEM OM-3 body
- Better fit
Want an in-camera stack with more than eight focus positions
With suitable lenses, the OM-3 goes up to fifteen. Either one ends with a cropped JPEG.
- OM SYSTEM OM-5 Mark II body
- Not suitable
- OM SYSTEM OM-3 body
- Better fit
In practice
Differences you will notice
Behind the same USB-C plug are two different power-bank routines
Say the camera finishes a walk and then becomes a desk recording rig. The OM-3 takes a suitable USB PD source rated at least 27W with the specified voltage profiles. The OM-5 II takes 5V1.5A only to slow battery drain, and it still shuts off when the internal battery runs out. A more powerful bank does not change that. Both need a battery that is adequately charged, and neither arrangement gets around heat or card limits. Once you are back outdoors, close the covers again before counting on the rated weather-resistant setup. What matters is how the whole power arrangement works. Both sockets being USB-C does not settle it.
How we worked this out
Based on the official supply requirements and weather precautions. No claim of uninterrupted runtime or powered use in rain.
Sticking with a familiar lens can cost you the feature you bought for a moving pet
When a dog is running at you, being able to refocus between frames counts for more than the biggest burst number on the spec sheet. The OM-5 II’s tracking Pro Capture runs at 10fps and leaves out Micro Four Thirds lenses from other manufacturers. Its 30fps mode keeps focus fixed. The OM-3 has a regular refocusing mode that goes up to 20fps, and its 50fps option still requires a specifically supported lens. With buffer settings at maximum, 14 frames at 10fps cover about 1.4 seconds, while 70 at 20fps cover 3.5 seconds. Those are nominal windows with the shutter half-pressed. They do not promise sharp photographs. Confirm the exact lens and mode before you buy either body for that moment.
How we worked this out
14/10=1.4 seconds and 70/20=3.5 seconds, using the chosen nominal rates and full buffers. Electronic-shutter artifacts, settings and lens limits still apply.
Stacking more frames does not give you a high-resolution RAW close-up
Someone who shoots small craft pieces as a hobby may like that the OM-3 can combine up to fifteen focus positions where the OM-5 II stops at eight. Each needs a compatible stacking lens and saves the finished composite as a JPEG whose view is roughly 7% tighter in each dimension. Leave enough room in the frame for that crop, and keep the subject still. Focus stacking and High Res Shot cannot be combined in a single capture on either camera. If you are after a higher-resolution RAW composite with deep focus, the OM-3 by itself does not complete that workflow. The additional frames only pay off when the subject, the focus spacing and the final output can use them.
How we worked this out
Covers the documented frame ranges, JPEG output, crop and the modes that exclude each other. It does not claim that more frames always improve the picture.
Option A
OM SYSTEM, V210070BU000
OM SYSTEM OM-5 Mark II body
On long outings you take the same compatible lens and like the body being 78g lighter.
- Best for
- On long outings you take the same compatible lens and like the body being 78g lighter.
Facts we checked
- Body with battery/card: 418g
- Battery and external supply: BLS-50, 5V1.5A reduces drain
- Tracking pre-capture at ordinary rate: 10fps, up to 14 frames
- In-camera focus stack: Three to eight exposures
Option B
OM SYSTEM, V210050SW000
OM SYSTEM OM-3 body
You want separate headphone monitoring, plus a camera that takes the specified 27W-or-greater USB PD source.
- Best for
- You want separate headphone monitoring, plus a camera that takes the specified 27W-or-greater USB PD source.
Facts we checked
- Body with battery/card: 496g
- Battery and external supply: BLX-1, specified USB PD source
- Tracking pre-capture at ordinary rate: Up to 20fps, up to 70 frames
- In-camera focus stack: Three to fifteen exposures
Spec by spec
Where they really differ
| Spec | OM SYSTEM OM-5 Mark II body | OM SYSTEM OM-3 body | In practice |
|---|---|---|---|
| Body with battery/card | 418g | 496g | With the same lens on each, the gap is 78g. |
| Battery and external supply | BLS-50, 5V1.5A reduces drain | BLX-1, specified USB PD source | Having the same USB-C plug says nothing about identical power behavior. |
| Tracking pre-capture at ordinary rate | 10fps, up to 14 frames | Up to 20fps, up to 70 frames | Decide on the focus mode and window length first, and the top fps figure after. |
| In-camera focus stack | Three to eight exposures | Three to fifteen exposures | Each one needs supported lenses and ends in a cropped JPEG composite. |
| Remote connection | 2.5mm wired option | Wireless RM-WR2 only | Owning a wired release can tip the choice to the smaller body. |
Trade-offs
What each pick costs you
With OM SYSTEM OM-5 Mark II body
- Pack charged BLS-50 spares. Check your specific lens before you rely on tracking pre-capture or focus stacking.
With OM SYSTEM OM-3 body
- Add compatible BLX-1 spares, a suitable PD source and, if needed, a wireless remote. The offer is body-only.
Change of plan
When the answer changes
Weight and the accessories you own come first
Go with OM SYSTEM OM-5 Mark II body. OM-5 II stays with the lighter BLS-50 and wired-remote setup.
A home rig calls for PD power or a longer pre-capture window
Go with OM SYSTEM OM-3 body. The OM-3 offers both, as long as you stay within its documented conditions.
Decision guide
Before you buy
You want a light camera for walks that is also ready the moment a pet moves, and useful for a longer supported recording session at home.
What this page can’t tell you
- Focus success and heat duration have not been measured or compared.
- Buffer duration is calculated nominally and is not recording time.
By the numbers
What the data shows
What we found across the mirrorless cameras we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| OM SYSTEM OM-5 Mark II body |
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| OM SYSTEM OM-3 body |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
OM SYSTEM OM-5 Mark II body
On long outings you take the same compatible lens and like the body being 78g lighter.
Your BLS-50 spares and supported close-up lenses already cover the photographs you take.
See price & reviews on AmazonOM SYSTEM OM-3 body
You want separate headphone monitoring, plus a camera that takes the specified 27W-or-greater USB PD source.
A longer pre-shutter window is what you need, once you have checked the exact lens and focus mode.
See price & reviews on AmazonEach link opens in a new tab.
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