Upgrade Guide
Sony FX3→Sony A7
Is it worth upgrading? Spec analysis, key improvements, and our verdict.
→
Situational
One clear hardware improvement over the FX3. Worth it if that specific upgrade aligns with what you shoot.
What's new in the A7
-
Resolution24MP vs 12MP (+12MP)
Unchanged or similar
-
StabilisationIBIS not present in new body
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 | A7 | |
|---|---|---|---|
| Portrait | +0.9 | ||
| Street | +1.9 | ||
| Travel | +0.5 | ||
| Wedding & Events | -0.7 | ||
| Vlogging & Video | — | ||
| Filmmaking | — | ||
| Documentary | -2.4 | ||
| Sports & Action | +0.3 | ||
| Landscape | +1.1 | ||
| Wildlife | +0.7 | ||
| Casual | -1.0 | ||
| Food | -1.0 | ||
| Macro | -0.5 | ||
| Architecture | +0.4 | ||
| Astrophotography | -1.1 |
Full spec comparison
| Spec | FX3 | A7 | |
|---|---|---|---|
| Price | £3,799 | £299 | |
| Released | 2021 | 2013 | ↓ |
| Sensor | 12.1MP full-frame BSI Exmor R CMOS (same as A7S III) | 24.3MP Full-Frame CMOS | |
| Resolution | 12MP | 24MP | ↑ |
| Video | 4K/120p, 4K/60p 10-bit, 12-bit RAW output, S-Log3, S-Cinetone | 1080p/60p | |
| Autofocus | Real-time tracking with subject recognition (human, animal) | 117 phase-detect + 25 contrast-detect AF points | |
| Stabilisation | 5-axis IBIS — 5 stops | No stabilisation | |
| Burst Rate | 10fps mechanical, 10fps electronic | 5fps | ↓ |
| Battery Life | ~640 shots (CIPA) | ~340 shots (CIPA) | ↓ |
| Weight | 715g (body only) | 474g (with battery and card) | ↑ |
| Weather Sealed | Yes | Yes | |
| Viewfinder | None — monitor/external EVF use only | EVF, OLED 2.36M dots, 0.71× magnification | |
| Screen | 3.0" touchscreen, fully articulating | 3.0" tilting LCD, 1.23M dots (no touch) | |
| Mount | Sony FE mount (full-frame E-mount) | Sony FE (full-frame E-mount) | |
| Memory Cards | Dual CFexpress Type A / SD UHS-II slots | Single SD UHS-I slot |
Compare side-by-side
⚖️ Compare these cameras
See FX3 and A7 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 A7 against your specific genres — not just specs.
Other upgrades from the FX3
Related buying guides
Camera family history