Upgrade Guide
Sony A7S III→Sony A9 III
Is it worth upgrading? Spec analysis, key improvements, and our verdict.
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Worthwhile
Clear improvements over the A7S III. Whether it justifies the cost depends on which upgrades matter most to your shooting.
What's new in the A9 III
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Resolution25MP vs 12MP (+13MP)
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StabilisationImproved — 8-stop IBIS
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Burst rate120fps blackout-free electronic vs 10fps mechanical
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Generation3 years newer (2023 vs 2020)
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 | A7S III | A9 III | |
|---|---|---|---|
| Portrait | +1.0 | ||
| Street | +0.4 | ||
| Travel | +0.4 | ||
| Wedding & Events | +1.0 | ||
| Vlogging & Video | +0.5 | ||
| Filmmaking | — | ||
| Documentary | +0.5 | ||
| Sports & Action | +2.0 | ||
| Landscape | +1.0 | ||
| Wildlife | +1.7 | ||
| Casual | +0.4 | ||
| Food | +1.1 | ||
| Macro | +1.8 | ||
| Architecture | +1.1 | ||
| Astrophotography | -1.0 |
Full spec comparison
| Spec | A7S III | A9 III | |
|---|---|---|---|
| Price | £3,389 | £5,699 | |
| Released | 2020 | 2023 | ↑ |
| Sensor | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) | 24.6MP full-frame Exmor RS CMOS (global shutter) | |
| Resolution | 12MP | 25MP | ↑ |
| Video | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p | 4K/120p, 4K/60p, 1080p/240p | |
| Autofocus | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition | AI subject recognition AF, 759-point phase-detect | |
| Stabilisation | 5.5-stop IBIS | 8-stop IBIS | |
| Burst Rate | 10fps mechanical | 120fps blackout-free electronic | ↑ |
| Battery Life | ~600 shots (CIPA) / ~70min continuous 4K recording | 530 shots (CIPA) | ↓ |
| Weight | 699g (with battery and card) | 703g (body only) | ↓ |
| Weather Sealed | Yes | Yes | |
| Viewfinder | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made | 0.64" Quad-XGA OLED EVF, 9.44M dots | |
| Screen | 3.0" vari-angle touchscreen, 1.44M dots | 3.2" fully articulating touchscreen | |
| Mount | Sony E-mount | Sony FE (E-mount) | |
| Memory Cards | Dual CFexpress Type A / SD UHS-II (both slots) | Dual CFexpress Type A / SD UHS-II |
Compare side-by-side
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