Upgrade Guide
Sony A5100→Sony Sony A9 III
Is it worth upgrading? Spec analysis, key improvements, and our verdict.
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Worthwhile
Clear improvements over the A5100. Whether it justifies the cost depends on which upgrades matter most to your shooting.
What's new in the Sony A9 III
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Weather sealingAdded — fully sealed body
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StabilisationIBIS added — significant for handheld and video
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Burst rate120fps blackout-free electronic vs 6fps
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Battery life530 shots (CIPA) vs ~400 shots (CIPA)
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Generation9 years newer (2023 vs 2014)
Unchanged or similar
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ResolutionSimilar (25MP)
Suitability by genre
| Genre | A5100 | Sony A9 III | |
|---|---|---|---|
| Casual | — | ||
| Travel | -4.5 | ||
| Portrait | +1.5 | ||
| Street | — | ||
| Vlogging & Video | — | ||
| Landscape | — | ||
| Sports & Action | +2.5 | ||
| Wildlife | — | ||
| Wedding & Events | — |
Full spec comparison
| Spec | A5100 | Sony A9 III | |
|---|---|---|---|
| Price | £200 | £5,999 | |
| Released | 2014 | 2023 | ↑ |
| Sensor | 24.3MP APS-C Exmor CMOS | 24.6MP full-frame Exmor RS CMOS (global shutter) | |
| Resolution | 24MP | 25MP | ↑ |
| Video | 1080p/60p | 4K/120p, 4K/60p, 1080p/240p | |
| Autofocus | Hybrid phase-detect / contrast-detect AF, face detection | AI subject recognition AF, 759-point phase-detect | |
| Stabilisation | None | 8-stop IBIS | |
| Burst Rate | 6fps | 120fps blackout-free electronic | ↑ |
| Battery Life | ~400 shots (CIPA) | 530 shots (CIPA) | ↑ |
| Weight | 224g (body only) | 703g body only | ↓ |
| Weather Sealed | No | Yes | ↑ |
| Viewfinder | None | 0.64" Quad-XGA OLED EVF, 9.44M dots | |
| Screen | 3.0" flip-up touchscreen, 921k dots | 3.2" fully articulating touchscreen | |
| Mount | Sony E-mount | Sony FE (E-mount) | |
| Memory Cards | Single SD / MemoryStick PRO Duo slot | Dual CFexpress Type A / SD UHS-II |
Compare side-by-side
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