Sony a7S → Sony a7S III
Is the upgrade worth it? Every change on the spec sheet, and an honest read on who should bother.
The bottom line
The Sony a7S III is 2 generations newer to your Sony a7S, released 6 years later. Across the full spec sheet it improves 13 items and steps back on 3. The changes that matter most: burst jumps from 5fps to 10fps; 4K goes from 30p to 120p; subject-detection AF is added. The Sony a7S III lists at $3,499 (the Sony a7S launched at $2,799, and older bodies typically sell for well under launch price on the used market). If several of the gains below map to how you shoot, this is a substantial step up; if none do, your current body keeps doing everything it does today.
Upgrade to the Sony a7S III if…
- ✓You shoot action, sports or wildlife — 10fps burst plus dedicated subject-tracking AF keeps up with fast, erratic movement where 5fps would drop frames.
- ✓You shoot video seriously — it brings smoother 120p 4K vs 30p, 10-bit internal colour and no per-clip recording limit (vs a 29-min cap).
- ✓You vlog or shoot handheld solo — the fully-articulating screen flips to face you and there's a mic input for clean audio.
- ✓You need backup-while-you-shoot reliability — dual card slots (the other has one) matter for paid work like weddings and events.
Stick with the Sony a7S if…
- •You're budget-conscious — it launched at $2,799, about $700 less, freeing money for lenses.
- •You value portability — at 566g (1.25 lb) it's noticeably lighter than the 699g (1.54 lb) alternative for travel and all-day carry.
- •None of the headline changes map to what you actually shoot — the camera you own doesn't get worse when a successor launches.
What changed (29 items)
↑ 13 improved · ↓ 3 stepped back · → changed without a clear better/worse
| Spec | Sony a7S | Sony a7S III |
|---|---|---|
| Imaging | ||
| →Sensor Type | CMOS | BSI CMOS |
| →Image Processor | BIONZ X | BIONZ XR |
| ↓Effective Resolution | 12.2 MP | 12.1 MP |
| Exposure Control | ||
| →ISO Range (Native) | 100 – 102400 | 80 – 102400 |
| →ISO Range (Extended) | 50 – 409600 | 40 – 409600 |
| Still Image Capture | ||
| ↑Continuous Shooting | 5 fps | 10 fps |
| Video Capture | ||
| ↑4K Recording | Up to 30p | Up to 120p |
| ↑1080p Recording | Up to 120p | Up to 240p |
| ↑10-bit Internal | No | Yes |
| →Recording Limit | 29 min | No limit |
| →Log Profiles | S-Log2 | S-Log3 / HLG / S-Cinetone |
| →HDMI Output | Micro (Type D) | Full-size (Type A) |
| Focus | ||
| ↑Eye AF | No | Yes |
| ↑Animal AF | No | Yes |
| Viewfinder | ||
| ↑EVF Resolution | 2.36M dots | 9.44M dots |
| ↑EVF Magnification | 0.71x | 0.91x |
| Monitor | ||
| ↑LCD Resolution | 1.23M dots | 1.44M dots |
| →LCD Type | Tilting | Vari-Angle |
| ↑Touch Screen | No | Yes |
| Interface | ||
| →Bluetooth | v4.0 | v5 |
| →USB | Micro USB 2.0 | USB-C 3.2 |
| →Memory Card Slots | 1x SD UHS-I | 2x CFexpress Type A / SD UHS-II |
| General | ||
| ↓Price (MSRP) | $2,799 | $3,499 |
| →Dimensions | 126.9×94.4×48.2 mm | 128.9×96.9×80.8 mm |
| ↓Weight | 566g (1.25 lb) | 699g (1.54 lb) |
| ↑Weather Sealed | No | Yes |
| ↑Battery Life (EVF) | 240 shots | 510 shots |
| ↑Battery Life (LCD) | 310 shots | 600 shots |
| →Battery Type | NP-FW50 | NP-FZ100 |
What stayed the same (17 items)
Everything below is identical on both bodies — if these are what you buy a camera for, the Sony a7S already has them.
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Sony a7S (keep or buy used)
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Sony a7S III
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Frequently asked
Is it worth upgrading from the Sony a7S to the Sony a7S III?
The Sony a7S III is 2 generations newer to your Sony a7S, released 6 years later. Across the full spec sheet it improves 13 items and steps back on 3. The changes that matter most: burst jumps from 5fps to 10fps; 4K goes from 30p to 120p; subject-detection AF is added. The Sony a7S III lists at $3,499 (the Sony a7S launched at $2,799, and older bodies typically sell for well under launch price on the used market). If several of the gains below map to how you shoot, this is a substantial step up; if none do, your current body keeps doing everything it does today.
What are the biggest improvements of the Sony a7S III over the Sony a7S?
Across the spec sheet the Sony a7S III improves 13 items. The most significant: 10fps burst plus dedicated subject-tracking AF keeps up with fast, erratic movement where 5fps would drop frames. it brings smoother 120p 4K vs 30p, 10-bit internal colour and no per-clip recording limit (vs a 29-min cap). the fully-articulating screen flips to face you and there's a mic input for clean audio. dual card slots (the other has one) matter for paid work like weddings and events.
What does the Sony a7S still do just as well as the Sony a7S III?
17 spec items are identical between the two, including sensor size (Full-Frame), lens mount (Sony E), mechanical shutter (1/8000), electronic shutter (1/8000), flash sync speed (1/250), built-in flash (No). If those cover your needs, the older body remains fully capable.
Does the Sony a7S III give anything up compared to the Sony a7S?
Yes — 3 items on the spec sheet move the other way: effective resolution (12.2 MP → 12.1 MP), price (msrp) ($2,799 → $3,499), weight (566g (1.25 lb) → 699g (1.54 lb)).