Sony
Alpha 7 IV
33MP hybrid all-rounder with 10-bit 4K 60p and AI-powered subject tracking.
$2,499
Released Oct 2021
Sony
FX3
Compact full-frame cinema line camera with S-Cinetone and pro video ergonomics.
$3,899
Released Feb 2021
Alpha 7 IV is 8 months newer.
Wins
Alpha 7 IV
Wins
FX3
7 categories tied
TL;DR — Key differences
- AAlpha 7 IV has higher RAW buffer depth (828 frames vs 120 frames)
- AAlpha 7 IV has higher Resolution (33 MP vs 12.1 MP)
- BFX3 has higher ISO max (native) (102,400 vs 51,200)
- BFX3 has higher 4K max frame rate (120 fps vs 60 fps)
- BFX3 has lower ISO min (native) (80 vs 100)
Key specs at a glance
Size and weight, to scale
Alpha 7 IV
131 × 96 × 80 mm
658 g (1.45 lb / 23.21 oz)
FX3
130 × 78 × 85 mm
715 g (1.58 lb / 25.22 oz)
Alpha 7 IV is 5mm thinner than FX3 but it is also 2mm wider and 19mm taller.
Alpha 7 IV is 57 g lighter than FX3.
Depth (front-to-back): 80mm Alpha 7 IV · 85mm FX3
Sensor size, to scale
Alpha 7 IV
35.9 × 23.9 mm · Full Frame
858 mm² area
FX3
35.6 × 23.8 mm · Full Frame
847 mm² area
Lens ecosystem
Native lens selection
Alpha 7 IV
✓ more lensesSony E
350+
native lenses available
FX3
✓ 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
Alpha 7 IV
Dimensions (W×H×D mm)
Adds 131.3, 96.4, 79.8
RAW buffer depth
828 frames vs 120 frames — higher is better
Subject recognition
Adds Bird, Insect, Car/Train…
Resolution
33 MP vs 12.1 MP — higher is better
AF points / zones
759 vs 627 — higher is better
Weight
658 g vs 715 g — lower is better
Reasons to choose
FX3
AF low-light limit
-6 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 129.7, 77.8, 84.5
ISO max (native)
102,400 vs 51,200 — higher is better
4K max frame rate
120 fps vs 60 fps — higher is better
ISO min (native)
80 vs 100 — lower is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓AF frame coverage — Both 94 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Burst (mechanical) — Both 10 fps
- ✓Burst (electronic) — Both 10 fps
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Alpha 7 IV
Pros
- ✓33MP — more detail for cropping and print
- ✓10-bit 4K 60p (Super35 crop) / 4K 30p full-frame
- ✓Full-size HDMI port
- ✓759 phase-detect AF points
Cons
- –4K 60p requires Super35 crop
- –10fps burst lags behind R6 II at 40fps
- –Complex menu system
FX3
Pros
- ✓Cinema form factor
- ✓S-Log3 / S-Cinetone
- ✓Compact for gimbals
- ✓Full-frame sensor
Cons
- –No EVF
- –Still photo ergonomics limited
- –Single card slot
Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for portraits, Alpha 7 IV or FX3?
Alpha 7 IV scores 9.0/10 versus 6.5/10 for FX3 — 33MP — ample resolution for portraits.
What's the resolution difference between the Alpha 7 IV and FX3?
Alpha 7 IV is 33 MP and FX3 is 12.1 MP, so the Alpha 7 IV captures more detail for cropping and large prints.
Do the Alpha 7 IV and FX3 have in-body image stabilization?
Alpha 7 IV has 5.5-stop in-body image stabilization, while fX3 has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the Alpha 7 IV or the FX3?
Alpha 7 IV reaches 10 fps electronic. FX3 reaches 10 fps electronic.
What's the weight difference between the Alpha 7 IV and FX3?
Alpha 7 IV weighs 658 g and FX3 weighs 715 g, so the Alpha 7 IV is 57 g lighter.
Do the Alpha 7 IV and FX3 record 4K video?
Alpha 7 IV: 4K up to 60p. FX3: 4K up to 120p.
Are the Alpha 7 IV and FX3 weather sealed?
Alpha 7 IV: Yes. FX3: Yes.
Which has better battery life?
Rated battery life is 580 shots (CIPA) for the Alpha 7 IV and 580 shots for the FX3, giving the FX3 the edge.
How much does each cost?
Alpha 7 IV launched at $2,499 and FX3 at $3,899. The Alpha 7 IV is $1,400 less.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed May 2026.
Product images courtesy of Sony press materials.