Decision tools · Compare
A6100 vs A7R III
Quick take: The A7R III has the highest resolution at 42MP; the A6100 is the most affordable; only the A7R III is weather sealed.
16 specs side by side·15 genres scored·UK prices from Wex Photo Video and Clifton Cameras
How to read this page. Highlighted cells win that row on the spec alone. Genre scores are the engine's base scores (enthusiast, photo and video); Camera Match re-weights them for your level and priorities. Price buttons are affiliate links; the price you pay is the same.
Sony
A7R III 2017
Best for Landscape, studio & commercial photography
£1799
list price · used from £745 at Wex Photo Video
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Verdictwhich should you buy?
A6100 — Beginner, Family, Travel: Best autofocus in its class for the price.
A7R III — Landscape, Studio & Commercial Photography: The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.
Who should buy what
A6100 (2019)
is the right camera for you if…
- First-time mirrorless buyers who want solid AF
- Families stepping up from a smartphone
A7R III (2017)
is the right camera for you if…
- Landscape and studio photographers who need 42MP resolution at a used-price discount vs A7R IV
- Canon/Nikon DSLR professionals considering a mirrorless switch at a lower investment
- Commercial and product photographers who want full-frame resolution with IBIS for handheld work
- Portrait photographers who want the sharpest possible full-frame files for large print work
Full specificationsthe better value in each row is highlighted
| Specification | A6100Sony · 2019 | A7R IIISony · 2017 |
|---|---|---|
| Price | £649Best | £1,799 |
| Sensor | APS-C Exmor CMOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 24.2MP | 42.4MPBest |
| Video | 4K 30fps | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | 425-point phase-detect, real-time tracking | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | No stabilisation | 5-axis IBIS — 5.5 stops |
| Burst Rate | 11fpsBest | 10fps with AF/AE tracking |
| Battery Life | 420 shots (CIPA) | ~650 shots (CIPA)Best |
| Weight | 396g (body only)Best | 650g (body only) |
| Dimensions | 119.9 × 66.9 × 59.4mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Not weather sealed | YesBest |
| Viewfinder | EVF 0.39" 1.44M-dot | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.0" tilting touchscreen, 921k-dot | 3.0" touchscreen, tilting |
| Mount | Sony E-Mount | Sony FE mount (full-frame E-mount) |
| Memory Cards | SD UHS-I / Memory Stick | Dual SD slots (one UHS-II) |
| Connectivity | Wi-Fi, Bluetooth 4.1, Micro USB, Micro HDMI | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Wins the row — price, resolution, burst, battery, weight and sealing are compared; text specs aren't ranked.
How they score by genreengine base scores out of 10
Genre
A6100
A7R III
Portrait
6.7/10
7.8/10
Street
7.3/10
6.1/10
Travel
6.2/10
6.1/10
Wedding & Events
5.1/10
7.5/10
Vlogging & Video
5.9/10
—
Filmmaking
4.9/10
6.3/10
Documentary
5.2/10
6.7/10
Sports & Action
6.5/10
7.3/10
Landscape
4.9/10
7.4/10
Wildlife
6.9/10
7.6/10
Casual
6.4/10
4.7/10
Food
6.2/10
7.0/10
Macro
5.2/10
6.2/10
Architecture
5.5/10
7.5/10
Astrophotography
6.0/10
7.0/10
Scores come from the same engine as Camera Match: verified specifications weighted by what each genre needs, with documented adjustments. The product page and this table show the enthusiast base score. See how scores are calculated →
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