BFvs A7 III
Sigma
BF (2025)
Starting from £1799 new
Best for Photographers who want to strip back every distraction
View BF
GearScore™ Verdict — Which should you buy?
Photographers Who Want To Strip Back Every Distraction — BF (2025): The most radical camera in years — no dials, no buttons, just a flat aluminium body and total creative minimalism.
All-Round Photography & Video — A7 III (2018): Still one of the best all-round cameras money can buy — particularly strong used. The A7 III proved that full-frame doesn't have to mean compromises, and nothing at this price point has meaningfully beaten it.
Who should buy what
BF (2025)
- 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
A7 III (2018)
- Enthusiast photographers upgrading from APS-C for the first time
- Working photographers who need reliable AF and weather sealing
- Anyone who shoots in low light regularly
- Hybrid shooters needing both stills and video performance
Quick take: The a7 iii has the highest resolution at 24mp; the a7 iii is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | BF (2025) | A7 III (2018) |
|---|---|---|
| Price | £1,799 | £1,699 |
| Sensor | 24MP full-frame BSI CMOS | 24.2MP Full-Frame Exmor R BSI CMOS |
| Resolution | 24.0MP | 24.2MP |
| Video | 4K/30p, 1080p/60p | 4K/30p (6K oversampled), 1080p/120p slow-motion |
| Autofocus | Phase-detect AF — face and eye detection | Phase-detect, 693 points, real-time Eye AF & animal AF |
| Stabilisation | 5-axis IBIS — 7 stops | 5-axis IBIS, 5 stops |
| Burst Rate | 9fps electronic | 10fps with AF/AE tracking |
| Battery Life | ~400 shots (CIPA) | ~710 shots (CIPA) |
| Weight | 427g body only | 565g (body, battery, card) |
| Dimensions | 127.0 × 75.0 × 45.0mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.75× 3.68M-dot | EVF, 2.36M dots, 0.78× magnification |
| Screen | 3.15" fully articulating touchscreen — primary interface | 3.0" tilting touchscreen, 921k dots |
| Mount | L-mount (Leica/Panasonic/Sigma) | Sony E-mount |
| Memory Cards | Single UHS-II SD slot | Dual SD (UHS-II slot 1, UHS-I slot 2) |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C (USB 3.2), Wi-Fi, Bluetooth, NFC |
Suitability by genre
| Genre | BF | A7 III |
|---|---|---|
| Street | ||
| Travel | ||
| Portrait | ||
| Landscape | — | |
| Sports | — | |
| Vlogging & Video | — | |
| Wildlife | — | |
| Video | — |
More comparisons with BF
Camera family history