Pentax
645Z
51MP medium format DSLR that made digital MF accessible — still prized for landscape and studio.
$8,499
Launch priceReleased Apr 2014
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 11.6 years newer.
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Wins
645Z
Wins
Alpha 7 V
3 categories tied
Which would you choose?
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 lower Weight (695 g vs 1470 g)
- 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)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share645Z
156 × 117 × 123 mm
1470 g (3.24 lb / 51.85 oz)
Credit card
85.6 × 54 mm
for scale
Alpha 7 V
130 × 96 × 82 mm
695 g (1.53 lb / 24.52 oz)
645Z is 26mm wider, 21mm taller, and 41mm thicker than Alpha 7 V.
645Z is 775 g heavier than Alpha 7 V.
Depth (front-to-back): 123mm 645Z · 82mm Alpha 7 V
Back view, to scale
Width × Height — same proportions as the front of the body.
645Z
156 × 117 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.
645Z
156 × 123 mm
Credit card
85.6 × 54 mm
Alpha 7 V
130 × 82 mm
Sensor size, to scale
645Z
43.8 × 32.8 mm · Medium Format
1437 mm² area
Alpha 7 V
35.9 × 23.9 mm · Full Frame
858 mm² area
1.7× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
645Z: mount data unavailable
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
645Z
Dimensions (W×H×D mm)
Adds 156, 117, 123
ISO min (native)
64 vs 100 — lower is better
Resolution
51.4 MP vs 33 MP — higher 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…
Weight
695 g vs 1470 g — lower is better
ISO max (native)
51,200 vs 25,600 — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓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 (IBIS) — Both support in-body stabilization (ibis)
- ✓Weather sealing — Both support weather sealing
Pros & cons at a glance
Editorially curated highlights and trade-offs.
645Z
Pros
- ✓51MP medium format
- ✓CMOS sensor
- ✓Pentax color
- ✓Relatively affordable MF
Cons
- –Huge body
- –Slow operation
- –Limited lens line vs Hasselblad
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 645Z and Alpha 7 V at major authorized retailers.
Pentax 645Z
Sony Alpha 7 V
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, 645Z or Alpha 7 V?
Alpha 7 V scores 9.5/10 versus 6.5/10 for 645Z — 30fps burst — pro-level action capture.
What's the resolution difference between the 645Z and Alpha 7 V?
645Z is 51.4 MP and Alpha 7 V is 33 MP, so the 645Z captures more detail for cropping and large prints.
Do the 645Z and Alpha 7 V have in-body image stabilization?
645Z has 7-stop in-body image stabilization, while Alpha 7 V has 7.5-stop in-body image stabilization.
Which shoots faster bursts — the 645Z or the Alpha 7 V?
645Z reaches 20 fps electronic. Alpha 7 V reaches 30 fps electronic.
What's the weight difference between the 645Z and Alpha 7 V?
645Z weighs 1470 g and Alpha 7 V weighs 695 g, so the Alpha 7 V is 775 g lighter.
Do the 645Z and Alpha 7 V record 4K video?
645Z: 4K up to 60p. Alpha 7 V: 4K up to 120p.
Are the 645Z and Alpha 7 V weather sealed?
645Z: Yes. Alpha 7 V: Yes.
Which has better battery life?
Rated battery life is 640 shots (CIPA) for the 645Z and 630 shots for the Alpha 7 V, giving the 645Z the edge.
How much does each cost?
645Z launched at $8,499 and Alpha 7 V at $2,899. The Alpha 7 V is $5,600 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way 645Z vs Alpha 7 V vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.
Product images courtesy of Pentax and Sony press materials.