Canon
EOS R6 Mark II
Versatile 24.2MP full-frame hybrid with class-leading AF and 4K 60p video.
$2,499
Released Nov 2022
OM System
OM-3 ASTRO
Astrophotography-focused OM-3 variant with 20.4MP stacked sensor, H-alpha-friendly filter tuning, IP53 sealing, and 7.5-stop Sync IS.
$2,499
Released Jul 2025
OM-3 ASTRO is 2.6 years newer.
Wins
EOS R6 Mark II
Wins
OM-3 ASTRO
5 categories tied
TL;DR — Key differences
- BOM-3 ASTRO has higher Burst (electronic) (120 fps vs 40 fps)
- AEOS R6 Mark II has higher Max video bit rate (340 Mbps vs 150 Mbps)
- AEOS R6 Mark II has higher Card slots (2 vs 1)
- AEOS R6 Mark II has higher EVF resolution (3,690,000 vs 2,360,000)
- BOM-3 ASTRO has lower Weight (496 g vs 680 g)
Key specs at a glance
Size and weight, to scale
EOS R6 Mark II
138 × 98 × 88 mm
680 g (1.50 lb / 23.99 oz)
OM-3 ASTRO
139 × 89 × 46 mm
496 g (1.09 lb / 17.50 oz)
EOS R6 Mark II is 1mm narrower than OM-3 ASTRO but it is also 10mm taller and 43mm thicker.
EOS R6 Mark II is 184 g heavier than OM-3 ASTRO.
Depth (front-to-back): 88mm EOS R6 Mark II · 46mm OM-3 ASTRO
Back view, to scale
Width × Height — same proportions as the front of the body.
EOS R6 Mark II
138 × 98 mm
OM-3 ASTRO
139 × 89 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
EOS R6 Mark II
138 × 88 mm
OM-3 ASTRO
139 × 46 mm
Sensor size, to scale
EOS R6 Mark II
35.9 × 23.9 mm · Full Frame
858 mm² area
OM-3 ASTRO
17.4 × 13 mm · Compact / large-type
226 mm² area
3.8× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
EOS R6 Mark II
Canon RF
105+
native lenses available
OM-3 ASTRO
✓ 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
EOS R6 Mark II
Dimensions (W×H×D mm)
Adds 138.4, 98.4, 88.4
Subject recognition
Adds Dogs, Cats, Horses…
Max video bit rate
340 Mbps vs 150 Mbps — higher is better
AA filter
Only EOS R6 Mark II supports it
Internal RAW video
Only EOS R6 Mark II supports it
Card slots
2 vs 1 — higher is better
Headphone jack (3.5mm)
Only EOS R6 Mark II supports it
EVF resolution
3,690,000 vs 2,360,000 — higher is better
Reasons to choose
OM-3 ASTRO
AF low-light limit
-8 EV vs -6.5 EV — lower is better
Dimensions (W×H×D mm)
Adds 139.3, 88.9, 45.8
Burst (electronic)
120 fps vs 40 fps — higher is better
Subject recognition
Adds Animals, Motorsports, Airplanes
Card types
Adds SD UHS-I
Codecs
Adds MOV
Weight
496 g vs 680 g — lower is better
ISO min (native)
80 vs 100 — lower is better
Both cameras share
- ✓ISO max (native) — Both 102,400
- ✓AF points / zones — Both 1053
- ✓AF frame coverage — Both 100 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
Pros & cons at a glance
Editorially curated highlights and trade-offs.
EOS R6 Mark II
Pros
- ✓Up to 40fps electronic burst
- ✓4K 60p oversampled from 6K
- ✓Dual Pixel CMOS AF II — superb subject tracking
- ✓8-stop IBIS
- ✓Fully articulating touchscreen
Cons
- –24.2MP may feel limiting for large prints
- –No CFexpress on base body
- –Short battery life vs. A7 IV
OM-3 ASTRO
Pros
- ✓Astro-tuned sensor filter
- ✓20.4MP stacked BSI Live MOS
- ✓IP53 weather sealing
- ✓7.5-stop Sync IS
Cons
- –Specialized astro variant
- –Micro Four Thirds sensor
- –Premium price
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for portraits, EOS R6 Mark II or OM-3 ASTRO?
EOS R6 Mark II scores 8.5/10 versus 4.0/10 for OM-3 ASTRO — 24.2MP — solid resolution.
What's the resolution difference between the EOS R6 Mark II and OM-3 ASTRO?
EOS R6 Mark II is 24.2 MP and OM-3 ASTRO is 20.4 MP, so the EOS R6 Mark II captures more detail for cropping and large prints.
Do the EOS R6 Mark II and OM-3 ASTRO have in-body image stabilization?
EOS R6 Mark II has 8-stop in-body image stabilization, while oM-3 ASTRO has 6.5-stop in-body image stabilization.
Which shoots faster bursts — the EOS R6 Mark II or the OM-3 ASTRO?
EOS R6 Mark II reaches 40 fps electronic. OM-3 ASTRO reaches 120 fps electronic.
What's the weight difference between the EOS R6 Mark II and OM-3 ASTRO?
EOS R6 Mark II weighs 680 g and OM-3 ASTRO weighs 496 g, so the OM-3 ASTRO is 184 g lighter.
Do the EOS R6 Mark II and OM-3 ASTRO record 4K video?
EOS R6 Mark II: 4K up to 60p. OM-3 ASTRO: 4K up to 60p.
Are the EOS R6 Mark II and OM-3 ASTRO weather sealed?
EOS R6 Mark II: Yes. OM-3 ASTRO: Yes.
Which has better battery life?
Rated battery life is 760 shots (CIPA) for the EOS R6 Mark II and 640 shots for the OM-3 ASTRO, giving the EOS R6 Mark II the edge.
How much does each cost?
Both launched at $2,499.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Canon and OM System press materials.