Sony
Alpha 7S III
12MP low-light video specialist with 4K 120p, 16-bit RAW HDMI, and excellent autofocus.
$3,499
Launch priceReleased Sep 2020
Sony
FX2
Compact full-frame cinema camera with 4K 120p, S-Cinetone, and active cooling.
$2,499
Launch priceReleased Feb 2025
FX2 is 4.5 years newer.
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Wins
Alpha 7S III
Wins
FX2
8 categories tied
Which would you choose?
TL;DR — Key differences
- AAlpha 7S III has higher Max video bit rate (600 Mbps vs 200 Mbps)
- BFX2 has higher Resolution (33 MP vs 12.1 MP)
- AAlpha 7S III has higher EVF resolution (9,437,184 vs 3,690,000)
- AAlpha 7S III has higher ISO max (native) (102,400 vs 51,200)
- AAlpha 7S III 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 shareAlpha 7S III
129 × 97 × 81 mm
699 g (1.54 lb / 24.66 oz)
Credit card
85.6 × 54 mm
for scale
FX2
138 × 98 × 88 mm
720 g (1.59 lb / 25.40 oz)
Alpha 7S III is 9mm narrower, 1mm shorter, and 7mm thinner than FX2.
Alpha 7S III is 21 g lighter than FX2.
Depth (front-to-back): 81mm Alpha 7S III · 88mm FX2
Sensor size, to scale
Alpha 7S III
35.6 × 23.8 mm · Full Frame
847 mm² area
FX2
35.9 × 23.9 mm · Full Frame
858 mm² area
Lens ecosystem
Native lens selection
Alpha 7S III
✓ more lensesSony E
350+
native lenses available
FX2
✓ 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 7S III
AF low-light limit
-6 EV vs -4 EV — lower is better
Dimensions (W×H×D mm)
Adds 128.9, 96.9, 80.8
Max video bit rate
600 Mbps vs 200 Mbps — higher is better
EVF resolution
9,437,184 vs 3,690,000 — higher is better
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
EVF magnification
0.9 × vs 0.78 × — higher is better
Reasons to choose
FX2
Dimensions (W×H×D mm)
Adds 138, 98, 88
Subject recognition
Adds Bird, Insect, Car/Train…
Resolution
33 MP vs 12.1 MP — higher is better
Battery life (CIPA)
640 shots vs 600 shots — higher is better
Both cameras share
- ✓AA filter — Both support aa filter
- ✓AF points / zones — Both 759
- ✓AF frame coverage — Both 94 %
- ✓Eye AF — Both support eye af
- ✓Animal / bird AF — Both support animal / bird af
- ✓Burst (mechanical) — Both 10 fps
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Alpha 7S III
Pros
- ✓Best-in-class low light
- ✓4K 120p
- ✓Full-size HDMI
- ✓Strong IBIS
Cons
- –12MP stills limit
- –Older generation now
- –No 8K
FX2
Pros
- ✓4K 120p
- ✓S-Cinetone / S-Log3
- ✓Compact cinema body
- ✓Active cooling
Cons
- –No EVF
- –Photo ergonomics limited
- –Premium price
Decided which one is right for you?
Compare live prices for the Alpha 7S III and FX2 at major authorized retailers.
Sony Alpha 7S III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, Alpha 7S III or FX2?
FX2 scores 8.0/10 versus 5.5/10 for Alpha 7S III — Bird AF subject recognition.
What's the resolution difference between the Alpha 7S III and FX2?
Alpha 7S III is 12.1 MP and FX2 is 33 MP, so the FX2 captures more detail for cropping and large prints.
Do the Alpha 7S III and FX2 have in-body image stabilization?
Alpha 7S III has 5.5-stop in-body image stabilization, while FX2 has 5.5-stop in-body image stabilization.
Which shoots faster bursts — the Alpha 7S III or the FX2?
Alpha 7S III reaches 10 fps electronic. FX2 reaches 10 fps electronic.
What's the weight difference between the Alpha 7S III and FX2?
Alpha 7S III weighs 699 g and FX2 weighs 720 g, so the Alpha 7S III is 21 g lighter.
Do the Alpha 7S III and FX2 record 4K video?
Alpha 7S III: 4K up to 120p. FX2: 4K up to 60p.
Are the Alpha 7S III and FX2 weather sealed?
Alpha 7S III: Yes. FX2: Yes.
Which has better battery life?
Rated battery life is 600 shots (CIPA) for the Alpha 7S III and 640 shots for the FX2, giving the FX2 the edge.
How much does each cost?
Alpha 7S III launched at $3,499 and FX2 at $2,499. The FX2 is $1,000 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way Alpha 7S III vs FX2 vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed July 2026.