Pentax
K-1
Original 36MP full-frame Pentax DSLR with 5-axis SR, AA filter simulator, and weather sealing.
$1,799
Launch priceReleased Apr 2016
Sigma
FP2
Pocket-sized L-Mount full-frame body with a 24.5MP partially stacked sensor, 20fps stills, 6K OpenGate / ProRes RAW video, 70GB internal storage, and a Still/Cine mode switch.
$2,199
Launch priceReleased Nov 2026
FP2 is 10.5 years newer.
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Wins
K-1
Wins
FP2
2 categories tied
Which would you choose?
TL;DR — Key differences
- AK-1 has higher Burst (mechanical) (8 fps vs 0 fps)
- AK-1 has higher IBIS effectiveness (5 stops vs 0 stops)
- BFP2 has higher ISO max (native) (102,400 vs 25,600)
- BFP2 has lower Weight (460 g vs 1010 g)
- AK-1 has higher Card slots (2 vs 1)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareK-1
137 × 111 × 87 mm
1010 g (2.23 lb / 35.63 oz)
Credit card
85.6 × 54 mm
for scale
FP2
112 × 71 × 41 mm
460 g (1.01 lb / 16.23 oz)
K-1 is 25mm wider, 40mm taller, and 46mm thicker than FP2.
K-1 is 550 g heavier than FP2.
Depth (front-to-back): 87mm K-1 · 41mm FP2
Back view, to scale
Width × Height — same proportions as the front of the body.
K-1
137 × 111 mm
Credit card
85.6 × 54 mm
FP2
112 × 71 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
K-1
137 × 87 mm
Credit card
85.6 × 54 mm
FP2
112 × 41 mm
Sensor size, to scale
K-1
35.9 × 24 mm · Full Frame
862 mm² area
FP2
35.9 × 23.9 mm · Full Frame
858 mm² area
Lens ecosystem
Native lens selection
K-1
✓ more lensesPentax K
70+
native lenses available
FP2: mount data unavailable
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
K-1
Subject recognition
Adds Human, Animal, Bird…
Burst (mechanical)
8 fps vs 0 fps — higher is better
IBIS effectiveness
5 stops vs 0 stops — higher is better
Dimensions (W×H×D mm)
Adds 137, 110.5, 86.5
Card types
Adds SD UHS-II
AA filter
Only K-1 supports it
Pre-Capture / Pre-Release
Only K-1 supports it
In-body stabilization (IBIS)
Only K-1 supports it
Reasons to choose
FP2
AF low-light limit
-5 EV vs -3 EV — lower is better
Subject recognition
Adds Animals, Birds, People
Dimensions (W×H×D mm)
Adds 112, 71, 41
Card types
Adds SD, SDHC, SDXC
ISO max (native)
102,400 vs 25,600 — higher is better
Weight
460 g vs 1010 g — lower is better
Internal RAW video
Only FP2 supports it
Codecs
Adds ProRes RAW, ProRes RAW HQ
Both cameras share
- ✓ISO min (native) — Both 100
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Burst (electronic) — Both 20 fps
- ✓Weather sealing — Both support weather sealing
- ✓Touchscreen — Both support touchscreen
Pros & cons at a glance
Editorially curated highlights and trade-offs.
K-1
Pros
- ✓36MP full-frame
- ✓IBIS in DSLR
- ✓AA filter simulator
- ✓Weather sealed
Cons
- –Slow AF vs mirrorless
- –Heavy
- –Superseded by K-1 II
FP2
Pros
- ✓World's smallest full-frame body (376g body only)
- ✓24.5MP partially stacked sensor, 20fps electronic burst
- ✓6K OpenGate + ProRes RAW HQ, L-Log, 32-bit float audio
- ✓70GB internal storage + SD UHS-II + USB SSD
- ✓Tilting 3.15" LCD, dust/splash resistant, modular EVF-21
Cons
- –No in-body image stabilization (EIS in video only)
- –No built-in EVF — optional EVF-21 sold separately
- –Electronic shutter only
- –No headphone jack (USB audio only)
Decided which one is right for you?
Compare live prices for the K-1 and FP2 at major authorized retailers.
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, K-1 or FP2?
K-1 scores 9.0/10 versus 5.0/10 for FP2 — 20fps burst captures fleeting moments.
What's the resolution difference between the K-1 and FP2?
K-1 is 36.4 MP and FP2 is 24.5 MP, so the K-1 captures more detail for cropping and large prints.
Do the K-1 and FP2 have in-body image stabilization?
K-1 has 5-stop in-body image stabilization, while FP2 does not have IBIS.
Which shoots faster bursts — the K-1 or the FP2?
K-1 reaches 20 fps electronic. FP2 reaches 20 fps electronic.
What's the weight difference between the K-1 and FP2?
K-1 weighs 1010 g and FP2 weighs 460 g, so the FP2 is 550 g lighter.
Do the K-1 and FP2 record 4K video?
K-1: 4K up to 60p. FP2: 4K up to 59.94p.
Are the K-1 and FP2 weather sealed?
K-1: Yes. FP2: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the K-1 and 370 shots for the FP2, giving the K-1 the edge.
How much does each cost?
K-1 launched at $1,799 and FP2 at $2,199. The K-1 is $400 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way K-1 vs FP2 vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed October 2026.
Product images courtesy of Pentax and Sigma press materials.