Sony
Alpha 7 IV
33MP hybrid all-rounder with 10-bit 4K 60p and AI-powered subject tracking.
$2,499
Launch priceReleased Oct 2021
Sony
FX9
Full-frame 6K XDCAM camcorder with Dual Base ISO, S-Cinetone, Fast Hybrid AF, variable ND, and oversampled DCI 4K up to 60p.
$10,998
Launch priceReleased Sep 2019
Alpha 7 IV is 2.2 years newer.
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Wins
Alpha 7 IV
Wins
FX9
3 categories tied
Which would you choose?
TL;DR — Key differences
- AAlpha 7 IV has higher Burst (mechanical) (10 fps vs 0 fps)
- AAlpha 7 IV has higher Burst (electronic) (10 fps vs 0 fps)
- AAlpha 7 IV has higher IBIS effectiveness (5.5 stops vs 0 stops)
- AAlpha 7 IV has higher ISO max (native) (51,200 vs 4,000)
- AAlpha 7 IV has lower ISO min (native) (100 vs 800)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to share
Alpha 7 IV
131 × 96 × 80 mm
658 g (1.45 lb / 23.21 oz)
Credit card
85.6 × 54 mm
for scale
FX9
146 × 143 × 229 mm
2000 g (4.41 lb / 70.55 oz)
Alpha 7 IV is 15mm narrower, 46mm shorter, and 149mm thinner than FX9.
Alpha 7 IV is 1342 g lighter than FX9.
Depth (front-to-back): 80mm Alpha 7 IV · 229mm FX9
Back view, to scale
Width × Height — same proportions as the front of the body.
Alpha 7 IV
131 × 96 mm
Credit card
85.6 × 54 mm
FX9
146 × 143 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
Alpha 7 IV
131 × 80 mm
Credit card
85.6 × 54 mm
FX9
146 × 229 mm
Sensor size, to scale
Alpha 7 IV
35.9 × 23.9 mm · Full Frame
858 mm² area
FX9
35.7 × 18.8 mm · Full Frame
671 mm² area
1.3× larger sensor area = shallower depth of field and better low-light performance.
Lens ecosystem
Native lens selection
Alpha 7 IV
✓ more lensesSony E
350+
native lenses available
FX9
✓ 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
Burst (mechanical)
10 fps vs 0 fps — higher is better
Burst (electronic)
10 fps vs 0 fps — higher is better
Codecs
Adds XAVC HS, XAVC S, XAVC S-I…
IBIS effectiveness
5.5 stops vs 0 stops — higher is better
Dimensions (W×H×D mm)
Adds 131.3, 96.4, 79.8
ISO max (native)
51,200 vs 4,000 — higher is better
ISO min (native)
100 vs 800 — lower is better
Weight
658 g vs 2000 g — lower is better
Reasons to choose
FX9
AF low-light limit
-6 EV vs -4 EV — lower is better
Codecs
Adds XAVC-I, XAVC-L, MPEG HD422
Dimensions (W×H×D mm)
Adds 146, 142.5, 229
Card types
Adds XQD
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
- ✓4K max frame rate — Both 60 fps
- ✓Weather sealing — Both support weather sealing
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
FX9
Pros
- ✓Full-frame 6K Exmor R oversampling
- ✓Dual Base ISO 800 / 4000
- ✓S-Cinetone + S-Log3
- ✓Built-in variable ND (1/4–1/128)
- ✓12G-SDI + dual XQD slots
Cons
- –Large shoulder-cam form factor
- –Body-only is 2 kg
- –XQD media (not CFexpress)
- –6K not recorded natively (oversampled 4K)
Decided which one is right for you?
Compare live prices for the Alpha 7 IV and FX9 at major authorized retailers.
Sony Alpha 7 IV
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for wildlife, Alpha 7 IV or FX9?
Alpha 7 IV scores 8.0/10 versus 3.0/10 for FX9 — Bird AF subject recognition.
What's the resolution difference between the Alpha 7 IV and FX9?
Alpha 7 IV is 33 MP and FX9 is 20.5 MP, so the Alpha 7 IV captures more detail for cropping and large prints.
Do the Alpha 7 IV and FX9 have in-body image stabilization?
Alpha 7 IV has 5.5-stop in-body image stabilization, while FX9 does not have IBIS.
What's the weight difference between the Alpha 7 IV and FX9?
Alpha 7 IV weighs 658 g and FX9 weighs 2000 g, so the Alpha 7 IV is 1342 g lighter.
Do the Alpha 7 IV and FX9 record 4K video?
Alpha 7 IV: 4K up to 60p. FX9: 6K oversampled → DCI 4K / UHD 4K (max), 4K up to 60p.
Are the Alpha 7 IV and FX9 weather sealed?
Alpha 7 IV: Yes. FX9: Yes.
How much does each cost?
Alpha 7 IV launched at $2,499 and FX9 at $10,998. The Alpha 7 IV is $8,499 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way Alpha 7 IV vs FX9 vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed June 2026.
Product images courtesy of Sony press materials.