Insta360
Ace Pro 2
8K Leica-lens action camera with 1/1.3-inch sensor, 4K60 Active HDR, PureVideo low-light mode, and 12m waterproofing.
$449
Released Oct 2024
Pentax
K-3 Mark III
APS-C DSLR flagship with optical viewfinder and weather sealing.
$1,999
Released Apr 2021
Ace Pro 2 is 3.5 years newer.
Wins
Ace Pro 2
Wins
K-3 Mark III
7 categories tied
TL;DR — Key differences
- BK-3 Mark III has higher AF points / zones (101 vs 0)
- BK-3 Mark III has higher ISO max (native) (25,600 vs 6,400)
- AAce Pro 2 has lower Weight (177.2 g vs 520 g)
- BK-3 Mark III has higher Card slots (2 vs 1)
- AAce Pro 2 has higher Resolution (50 MP vs 25.7 MP)
Key specs at a glance
Size and weight, to scale
Ace Pro 2
72 × 52 × 38 mm
177.2 g (0.39 lb / 6.25 oz)
K-3 Mark III
138 × 98 × 88 mm
520 g (1.15 lb / 18.34 oz)
Ace Pro 2 is 66mm narrower, 46mm shorter, and 50mm thinner than K-3 Mark III.
Ace Pro 2 is 343 g lighter than K-3 Mark III.
Depth (front-to-back): 38mm Ace Pro 2 · 88mm K-3 Mark III
Sensor size, to scale
K-3 Mark III
23.5 × 15.6 mm · APS-C
367 mm² area
Lens ecosystem
Native lens selection
Ace Pro 2: 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
Ace Pro 2
Dimensions (W×H×D mm)
Adds 71.9, 52.2, 38
Card types
Adds microSD
Weight
177.2 g vs 520 g — lower is better
Internal RAW video
Only Ace Pro 2 supports it
Resolution
50 MP vs 25.7 MP — higher is better
Max video bit rate
200 Mbps vs 150 Mbps — higher is better
Reasons to choose
K-3 Mark III
AF points / zones
101 vs 0 — higher is better
Subject recognition
Adds Human, Animal, Bird…
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
Eye AF
Only K-3 Mark III supports it
Animal / bird AF
Only K-3 Mark III supports it
In-body stabilization
Only K-3 Mark III supports it
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Burst (mechanical) — Both 8 fps
- ✓Burst (electronic) — Both 20 fps
- ✓Pre-Capture / Pre-Release — Both support pre-capture / pre-release
- ✓RAW buffer depth — Both 120 frames
- ✓4K max frame rate — Both 60 fps
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Ace Pro 2
Pros
- ✓8K30 video
- ✓1/1.3-inch Leica lens
- ✓PureVideo night mode
- ✓12m waterproof
Cons
- –8K drains battery faster
- –Premium vs DJI Action
- –Fixed lens
K-3 Mark III
Pros
- ✓Optical viewfinder
- ✓Weather sealed
- ✓IBIS in DSLR
Cons
- –DSLR system declining
- –APS-C
- –Limited video
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, Ace Pro 2 or K-3 Mark III?
K-3 Mark III scores 10.0/10 versus 5.5/10 for Ace Pro 2 — 20fps burst captures fleeting moments.
What's the resolution difference between the Ace Pro 2 and K-3 Mark III?
Ace Pro 2 is 50 MP and K-3 Mark III is 25.7 MP, so the Ace Pro 2 captures more detail for cropping and large prints.
Do the Ace Pro 2 and K-3 Mark III have in-body image stabilization?
Ace Pro 2 does not have IBIS, while k-3 Mark III has 7-stop in-body image stabilization.
Which shoots faster bursts — the Ace Pro 2 or the K-3 Mark III?
Ace Pro 2 reaches 20 fps electronic. K-3 Mark III reaches 20 fps electronic.
What's the weight difference between the Ace Pro 2 and K-3 Mark III?
Ace Pro 2 weighs 177.2 g and K-3 Mark III weighs 520 g, so the Ace Pro 2 is 343 g lighter.
Do the Ace Pro 2 and K-3 Mark III record 4K video?
Ace Pro 2: 8K (max), 4K up to 60p. K-3 Mark III: 4K up to 60p.
Are the Ace Pro 2 and K-3 Mark III weather sealed?
Ace Pro 2: Yes. K-3 Mark III: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the Ace Pro 2 and 640 shots for the K-3 Mark III, giving the K-3 Mark III the edge.
How much does each cost?
Ace Pro 2 launched at $449 and K-3 Mark III at $1,999. The Ace Pro 2 is $1,550 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.