Sony
Alpha 7R III
42MP workhorse for landscape and studio before the A7R IV/V era.
$3,199
Launch priceReleased Oct 2017
Sony
FX5
2026 Cinema Line full-frame camera with 16.6MP stacked Exmor RS, 5K Open Gate, internal 16-bit X-OCN RAW, triple base ISO, and FX3-class compact mobility.
$4,899
Launch priceReleased Aug 2026
FX5 is 8.8 years newer.
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Wins
Alpha 7R III
Wins
FX5
5 categories tied
Which would you choose?
TL;DR — Key differences
- AAlpha 7R III has higher Burst (mechanical) (10 fps vs 0 fps)
- AAlpha 7R III has higher Burst (electronic) (10 fps vs 0 fps)
- AAlpha 7R III has lower ISO min (native) (100 vs 800)
- BFX5 has higher 4K max frame rate (120 fps vs 30 fps)
- AAlpha 7R III has higher Resolution (42.4 MP vs 16.6 MP)
Key specs at a glance
Size and weight, to scale
📸 Snap this size diff to shareAlpha 7R III
127 × 96 × 74 mm
657 g (1.45 lb / 23.18 oz)
Credit card
85.6 × 54 mm
for scale
FX5
132 × 79 × 87 mm
734 g (1.62 lb / 25.89 oz)
Alpha 7R III is 5mm narrower and 13mm thinner than FX5 but it is also 17mm taller.
Alpha 7R III is 77 g lighter than FX5.
Depth (front-to-back): 74mm Alpha 7R III · 87mm FX5
Back view, to scale
Width × Height — same proportions as the front of the body.
Alpha 7R III
127 × 96 mm
Credit card
85.6 × 54 mm
FX5
132 × 79 mm
Top view, to scale
Width × Depth (front-to-back) — see which body is chunkier on the table.
Alpha 7R III
127 × 74 mm
Credit card
85.6 × 54 mm
FX5
132 × 87 mm
Sensor size, to scale
Alpha 7R III
35.9 × 24 mm · Full Frame
862 mm² area
FX5
35.7 × 23.8 mm · Full Frame
850 mm² area
Lens ecosystem
Native lens selection
Alpha 7R III
✓ more lensesSony E
350+
native lenses available
FX5
✓ 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 7R III
Burst (mechanical)
10 fps vs 0 fps — higher is better
Burst (electronic)
10 fps vs 0 fps — higher is better
Dimensions (W×H×D mm)
Adds 126.9, 95.6, 73.7
ISO min (native)
100 vs 800 — lower is better
Resolution
42.4 MP vs 16.6 MP — higher is better
ISO max (native)
32,000 vs 12,800 — higher is better
Card types
Adds SD UHS-I
Codecs
Adds AVCHD
Reasons to choose
FX5
AF low-light limit
-6 EV vs -3 EV — lower is better
Dimensions (W×H×D mm)
Adds 132.3, 79, 86.95
4K max frame rate
120 fps vs 30 fps — higher is better
Codecs
Adds X-OCN LT, X-OCN C1, X-OCN C2…
Internal RAW video
Only FX5 supports it
Card types
Adds CFexpress Type A
EVF resolution
7,070,000 vs 3,686,400 — higher is better
AF points / zones
759 vs 399 — higher 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
- ✓RAW buffer depth — Both 120 frames
- ✓In-body stabilization (IBIS) — Both support in-body stabilization (ibis)
Pros & cons at a glance
Editorially curated highlights and trade-offs.
Alpha 7R III
Pros
- ✓42MP proven
- ✓10fps with AF
- ✓Dual slots
- ✓Great used value
Cons
- –Superseded
- –No 8K
- –Older AF
FX5
Pros
- ✓5K Open Gate + internal X-OCN RAW (LT / C1 / C2)
- ✓Triple base ISO 800 / 4000 / 12800 + Dual Gain
- ✓15+ stops DR (S-Log3) + BIONZ XR2 AI AF
- ✓5K 60p / 4K 120p / FHD 240p at launch
- ✓Compact body with IBIS, cooling, dual card slots
Cons
- –Body-only $4,899 — XLR handle / OLED EVF optional
- –Open Gate X-OCN only at launch (XAVC Open Gate via FW)
- –4K 240p / 5K 120p planned for 2027 firmware
- –No built-in EVF (optional DVF-EL1)
Decided which one is right for you?
Compare live prices for the Alpha 7R III and FX5 at major authorized retailers.
Sony Alpha 7R III
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Full specifications
✓ = category winner
Frequently asked
Quick answers generated from verified specs.
Which is better for sports, Alpha 7R III or FX5?
FX5 scores 6.5/10 versus 3.5/10 for Alpha 7R III — 759 AF points — good coverage.
What's the resolution difference between the Alpha 7R III and FX5?
Alpha 7R III is 42.4 MP and FX5 is 16.6 MP, so the Alpha 7R III captures more detail for cropping and large prints.
Do the Alpha 7R III and FX5 have in-body image stabilization?
Alpha 7R III has 5.5-stop in-body image stabilization, while FX5 has 5.5-stop in-body image stabilization.
What's the weight difference between the Alpha 7R III and FX5?
Alpha 7R III weighs 657 g and FX5 weighs 734 g, so the Alpha 7R III is 77 g lighter.
Do the Alpha 7R III and FX5 record 4K video?
Alpha 7R III: 4K up to 30p. FX5: 4K up to 120p.
Are the Alpha 7R III and FX5 weather sealed?
Alpha 7R III: Yes. FX5: Yes.
How much does each cost?
Alpha 7R III launched at $3,199 and FX5 at $4,899. The Alpha 7R III is $1,700 less.
Can't decide between two? Compare a third camera.
Add any camera to get a three-way Alpha 7R III vs FX5 vs X comparison.
Specs sourced from manufacturer data. Use-case scores algorithmically derived. Last reviewed July 2026.
Product images courtesy of Sony press materials.