Sigma
BF 2025
Best for Photographers who want to strip back every distraction
£1999
new today at Wex Photo Video
Decision tools · Compare
BF vs A7R III
Quick take: The A7R III has the highest resolution at 42MP.
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 £668 at Wex Photo Video
Price buttons are affiliate links — GearFrame may earn a commission at no extra cost to you. It never affects a score. Learn more
Verdictwhich should you buy?
BF — Photographers Who Want To Strip Back Every Distraction: The most radical camera in years — no dials, no buttons, just a flat aluminium body and total creative minimalism.
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
BF (2025)
is the right camera for you if…
- Photographers who find camera menus and dials a distraction from the creative process
- L-mount system users who want the lightest, most minimal full-frame body available
- Design enthusiasts who value the object quality and philosophy as much as the output
- Sigma fp/fp L users ready for a more radical step toward minimal photography
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 | BFSigma · 2025 | A7R IIISony · 2017 |
|---|---|---|
| Price | £1,999 | £1,799Best |
| Sensor | 24MP full-frame BSI CMOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 24.0MP | 42.4MPBest |
| Video | 6K/30p, 4K/30p, 1080p/120p, L-Log | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | Phase-detect AF — face and eye detection | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | No IBIS (electronic IS for video) | 5-axis IBIS — 5.5 stops |
| Burst Rate | 9fps electronic | 10fps with AF/AE trackingBest |
| Battery Life | ~400 shots (CIPA) | ~650 shots (CIPA)Best |
| Weight | 427g (body only)Best | 650g (body only) |
| Dimensions | 127.0 × 75.0 × 45.0mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | None: rear screen only | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.15" fixed touchscreen — primary interface | 3.0" touchscreen, tilting |
| Mount | L-mount (Leica/Panasonic/Sigma) | Sony FE mount (full-frame E-mount) |
| Memory Cards | 230GB internal storage only — no card slot | Dual SD slots (one UHS-II) |
| Connectivity | USB-C, Wi-Fi, Bluetooth | 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
BF
A7R III
Portrait
6.4/10
7.8/10
Street
6.6/10
6.1/10
Travel
6.5/10
6.1/10
Wedding & Events
5.0/10
7.5/10
Filmmaking
5.9/10
6.3/10
Documentary
6.9/10
6.7/10
Sports & Action
5.8/10
7.3/10
Landscape
6.1/10
7.4/10
Wildlife
6.3/10
7.6/10
Casual
5.5/10
4.7/10
Food
6.0/10
7.0/10
Macro
4.9/10
6.2/10
Architecture
5.5/10
7.5/10
Astrophotography
6.4/10
7.0/10
Fun & simple
5.0/10
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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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