Insta360
X6
Flagship 8K 360 camera with dual Sony 1/1.1-inch square sensors, native 8K50 and in-camera Dolby Vision, 120MP stills, 2.32-inch OLED, 140-minute 8K30 runtime, and 20m waterproofing.
$700
Launch priceReleased Aug 2026
Pentax
K-3 Mark III
APS-C DSLR flagship with optical viewfinder and weather sealing.
$1,999
Launch priceReleased Apr 2021
X6 is 5.3 years newer.
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Wins
X6
Wins
K-3 Mark III
1 categories tied
Which would you choose?
TL;DR — Key differences
- BK-3 Mark III has higher AF points / zones (101 vs 0)
- AX6 has higher Resolution (120 MP vs 25.7 MP)
- BK-3 Mark III has higher ISO max (native) (25,600 vs 6,400)
- AX6 has lower Weight (196 g vs 520 g)
- AX6 has higher 4K max frame rate (120 fps vs 60 fps)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share
X6
50 × 100 × 40 mm
196 g (0.43 lb / 6.91 oz)
Credit card
85.6 × 54 mm
for scale
K-3 Mark III
138 × 98 × 88 mm
520 g (1.15 lb / 18.34 oz)
X6 is 88mm narrower and 48mm thinner than K-3 Mark III but it is also 2mm taller.
X6 is 324 g lighter than K-3 Mark III.
Depth (front-to-back): 40mm X6 · 88mm K-3 Mark III
Back view, to scale
Width × Height — same proportions as the front of the body.
X6
50 × 100 mm
Credit card
85.6 × 54 mm
K-3 Mark III
138 × 98 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
X6
50 × 40 mm
Credit card
85.6 × 54 mm
K-3 Mark III
138 × 88 mm
Sensor size, to scale
K-3 Mark III
23.5 × 15.6 mm · APS-C
367 mm² area
Lens ecosystem
Native lens selection
X6: mount data unavailable
K-3 Mark III
✓ more lensesPentax K
70+
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
X6
Stabilization modes
Adds FlowState, 360° Horizon Lock, InstaFrame 2.0…
Dimensions (W×H×D mm)
Adds 50, 100, 40
Card types
Adds microSD
Resolution
120 MP vs 25.7 MP — higher is better
Subject recognition
Adds Pet, Object
Weight
196 g vs 520 g — lower is better
4K max frame rate
120 fps vs 60 fps — higher is better
RAW buffer depth
200 frames vs 120 frames — higher is better
Reasons to choose
K-3 Mark III
AF points / zones
101 vs 0 — higher is better
Dimensions (W×H×D mm)
Adds 138, 98, 88
Card types
Adds SD UHS-II
ISO max (native)
25,600 vs 6,400 — higher is better
Subject recognition
Adds Animal, Bird, Vehicle
Eye AF
Only K-3 Mark III supports it
Animal / bird AF
Only K-3 Mark III supports it
Codecs
Adds H.264
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓Weather sealing — Both support weather sealing
- ✓Touchscreen — Both support touchscreen
- ✓Wi-Fi — Both support wi-fi
- ✓Bluetooth — Both support bluetooth
Pros & cons at a glance
Editorially curated highlights and trade-offs.
X6
Pros
- ✓Dual Sony 1/1.1-inch sensors (1-inch equivalent 360)
- ✓Native 8K50 + in-camera Dolby Vision / 10-bit I-Log
- ✓120MP 360 photos; 5K60 / 4K120 single-lens
- ✓2600mAh Xtreme Battery: 140 min 8K30
- ✓20m waterproof + replaceable Lens 2.0
Cons
- –$700 Standard Bundle vs cheaper 360 rivals
- –8K50, not 8K60 vs Osmo 360 II
- –47GB usable built-in storage vs DJI 105GB
- –360 footage still needs reframing
K-3 Mark III
Pros
- ✓Optical viewfinder
- ✓Weather sealed
- ✓IBIS in DSLR
Cons
- –DSLR system declining
- –APS-C
- –Limited video
Decided which one is right for you?
Compare live prices for the X6 and K-3 Mark III at major authorized retailers.
Insta360 X6
Pentax K-3 Mark III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, X6 or K-3 Mark III?
K-3 Mark III scores 10.0/10 versus 5.5/10 for X6 — 20fps burst captures fleeting moments.
What's the resolution difference between the X6 and K-3 Mark III?
X6 is 120 MP and K-3 Mark III is 25.7 MP, so the X6 captures more detail for cropping and large prints.
Do the X6 and K-3 Mark III have in-body image stabilization?
X6 uses FlowState 6-axis + 360° Horizon Lock (electronic), while K-3 Mark III has 7-stop in-body image stabilization.
Which shoots faster bursts — the X6 or the K-3 Mark III?
X6 reaches 30 fps electronic. K-3 Mark III reaches 20 fps electronic.
What's the weight difference between the X6 and K-3 Mark III?
X6 weighs 196 g and K-3 Mark III weighs 520 g, so the X6 is 324 g lighter.
Do the X6 and K-3 Mark III record 4K video?
X6: 8K 360 (max), 4K up to 120p. K-3 Mark III: 4K up to 60p.
Are the X6 and K-3 Mark III weather sealed?
X6: Yes. K-3 Mark III: Yes.
Which has better battery life?
Rated battery life is 520 shots (CIPA) for the X6 and 640 shots for the K-3 Mark III, giving the K-3 Mark III the edge.
How much does each cost?
X6 launched at $700 and K-3 Mark III at $1,999. The X6 is $1,299 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way X6 vs K-3 Mark III vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed September 2026.
Product images courtesy of Insta360 and Pentax press materials.