Pentax
K-3 Mark III
APS-C DSLR flagship with optical viewfinder and weather sealing.
$1,999
Launch priceReleased Apr 2021
Sony
Alpha 7 V
33MP partially stacked Exmor RS hybrid with BIONZ XR2 AI, 30fps blackout-free burst, 7.5-stop IBIS, and 4K 60p oversampled from 7K.
$2,899
Launch priceReleased Dec 2025
Alpha 7 V is 4.6 years newer.
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Wins
K-3 Mark III
Wins
Alpha 7 V
4 categories tied
TL;DR — Key differences
- BAlpha 7 V has higher AF points / zones (759 vs 101)
- BAlpha 7 V has higher Max video bit rate (600 Mbps vs 150 Mbps)
- BAlpha 7 V has higher ISO max (native) (51,200 vs 25,600)
- BAlpha 7 V has higher 4K max frame rate (120 fps vs 60 fps)
- BAlpha 7 V has higher Burst (electronic) (30 fps vs 20 fps)
Key specs at a glance
Size and weight, to scale
K-3 Mark III
138 × 98 × 88 mm
520 g (1.15 lb / 18.34 oz)
Credit card
85.6 × 54 mm
for scale
Alpha 7 V
130 × 96 × 82 mm
695 g (1.53 lb / 24.52 oz)
K-3 Mark III is 8mm wider, 2mm taller, and 6mm thicker than Alpha 7 V.
K-3 Mark III is 175 g lighter than Alpha 7 V.
Depth (front-to-back): 88mm K-3 Mark III · 82mm Alpha 7 V
Back view, to scale
Width × Height — same proportions as the front of the body.
K-3 Mark III
138 × 98 mm
Credit card
85.6 × 54 mm
Alpha 7 V
130 × 96 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
K-3 Mark III
138 × 88 mm
Credit card
85.6 × 54 mm
Alpha 7 V
130 × 82 mm
Sensor size, to scale
K-3 Mark III
23.5 × 15.6 mm · APS-C
367 mm² area
Alpha 7 V
35.9 × 23.9 mm · Full Frame
858 mm² area
2.3× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
K-3 Mark III
Pentax K
70+
native lenses available
Alpha 7 V
✓ more lensesSony E
350+
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
K-3 Mark III
Dimensions (W×H×D mm)
Adds 138, 98, 88
Weight
520 g vs 695 g — lower is better
Subject recognition
Adds Vehicle
RAW buffer depth
120 frames vs 95 frames — higher is better
AF frame coverage
100 % vs 94 % — higher is better
Battery life (CIPA)
640 shots vs 630 shots — higher is better
EVF resolution
3,690,000 vs 3,686,400 — higher is better
Reasons to choose
Alpha 7 V
AF low-light limit
-4 EV vs -3 EV — lower is better
Dimensions (W×H×D mm)
Adds 130.3, 96.4, 82.4
AF points / zones
759 vs 101 — higher is better
Max video bit rate
600 Mbps vs 150 Mbps — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I
Subject recognition
Adds Insect, Car, Train…
AA filter
Only Alpha 7 V supports it
ISO max (native)
51,200 vs 25,600 — higher is better
Both cameras share
- ✓ISO min (native) — 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
- ✓In-body stabilization — Both support in-body stabilization
- ✓Weather sealing — Both support weather sealing
Pros & cons at a glance
Editorially curated highlights and trade-offs.
K-3 Mark III
Pros
- ✓Optical viewfinder
- ✓Weather sealed
- ✓IBIS in DSLR
Cons
- –DSLR system declining
- –APS-C
- –Limited video
Alpha 7 V
Pros
- ✓33MP partially stacked sensor — ~4.5× faster readout than α7 IV
- ✓Blackout-free 30 fps with full AF/AE (electronic shutter)
- ✓7.5-stop central / 6.5-stop peripheral IBIS (CIPA 2024)
- ✓759-point phase-detect AF down to EV -4 with AI subject recognition
- ✓7K oversampled 4K 60p (full-frame, no pixel binning) + 4K 120p
- ✓Pre-Capture and dual USB-C (10 Gbps + USB 2.0)
- ✓Up to 16 stops dynamic range
Cons
- –Premium price vs α7 IV
- –4K 120p typically requires APS-C / Super 35 crop
- –Heavier than α7 IV (695 g vs 659 g with battery)
- –Complex menu and feature set
Decided which one is right for you?
Compare live prices for the K-3 Mark III and Alpha 7 V at major authorized retailers.
Pentax K-3 Mark III
Sony Alpha 7 V
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for landscape, K-3 Mark III or Alpha 7 V?
Alpha 7 V scores 7.5/10 versus 5.0/10 for K-3 Mark III — 33MP — ample resolution.
What's the resolution difference between the K-3 Mark III and Alpha 7 V?
K-3 Mark III is 25.7 MP and Alpha 7 V is 33 MP, so the Alpha 7 V captures more detail for cropping and large prints.
Do the K-3 Mark III and Alpha 7 V have in-body image stabilization?
K-3 Mark III has 7-stop in-body image stabilization, while alpha 7 V has 7.5-stop in-body image stabilization.
Which shoots faster bursts — the K-3 Mark III or the Alpha 7 V?
K-3 Mark III reaches 20 fps electronic. Alpha 7 V reaches 30 fps electronic.
What's the weight difference between the K-3 Mark III and Alpha 7 V?
K-3 Mark III weighs 520 g and Alpha 7 V weighs 695 g, so the K-3 Mark III is 175 g lighter.
Do the K-3 Mark III and Alpha 7 V record 4K video?
K-3 Mark III: 4K up to 60p. Alpha 7 V: 4K up to 120p.
Are the K-3 Mark III and Alpha 7 V weather sealed?
K-3 Mark III: Yes. Alpha 7 V: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the K-3 Mark III and 630 shots for the Alpha 7 V, giving the K-3 Mark III the edge.
How much does each cost?
K-3 Mark III launched at $1,999 and Alpha 7 V at $2,899. The K-3 Mark III is $900 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.
Product images courtesy of Pentax and Sony press materials.