Upgrade Guide
Sony FX3→Sony A9 III
Is it worth upgrading? Spec analysis, key improvements, and our verdict.
→
Worthwhile
Clear improvements over the FX3. Whether it justifies the cost depends on which upgrades matter most to your shooting.
What's new in the A9 III
-
Resolution25MP vs 12MP (+13MP)
-
StabilisationImproved — 8-stop IBIS
-
Burst rate120fps blackout-free electronic vs 10fps mechanical, 10fps electronic
-
Generation2 years newer (2023 vs 2021)
Suitability by genre
Base scores — computed from verified specs for an enthusiast shooting photo and video. The Upgrade Checker adjusts them for your skill level.
| Genre | FX3 | A9 III | |
|---|---|---|---|
| Portrait | +2.8 | ||
| Street | +2.3 | ||
| Travel | +0.9 | ||
| Wedding & Events | +2.5 | ||
| Vlogging & Video | +0.3 | ||
| Filmmaking | -0.9 | ||
| Documentary | +0.2 | ||
| Sports & Action | +3.9 | ||
| Landscape | +1.8 | ||
| Wildlife | +3.4 | ||
| Casual | +0.4 | ||
| Food | +1.2 | ||
| Macro | +2.1 | ||
| Architecture | +1.4 | ||
| Astrophotography | +0.1 |
Full spec comparison
| Spec | FX3 | A9 III | |
|---|---|---|---|
| Price | £3,799 | £5,999 | |
| Released | 2021 | 2023 | ↑ |
| Sensor | 12.1MP full-frame BSI Exmor R CMOS (same as A7S III) | 24.6MP full-frame Exmor RS CMOS (global shutter) | |
| Resolution | 12MP | 25MP | ↑ |
| Video | 4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone | 4K/120p, 4K/60p, 1080p/240p | |
| Autofocus | Real-time tracking with subject recognition (human, animal) | AI subject recognition AF, 759-point phase-detect | |
| Stabilisation | 5-axis IBIS — 5 stops | 8-stop IBIS | |
| Burst Rate | 10fps mechanical, 10fps electronic | 120fps blackout-free electronic | ↑ |
| Battery Life | ~640 shots (CIPA) | 530 shots (CIPA) | ↓ |
| Weight | 715g (body only) | 703g (body only) | ↑ |
| Weather Sealed | Yes | Yes | |
| Viewfinder | None — monitor/external EVF use only | 0.64" Quad-XGA OLED EVF, 9.44M dots | |
| Screen | 3.0" touchscreen, fully articulating | 3.2" fully articulating touchscreen | |
| Mount | Sony FE mount (full-frame E-mount) | Sony FE (E-mount) | |
| Memory Cards | Dual CFexpress Type A / SD UHS-II slots | Dual CFexpress Type A / SD UHS-II |
Compare side-by-side
⚖️ Compare these cameras
See FX3 and A9 III next to each other with our interactive comparison tool.
Get a personalised upgrade score
Run the upgrade checker →
Tell us what you shoot and we'll score the A9 III against your specific genres — not just specs.
Other upgrades from the FX3
Related buying guides
Camera family history