BFvs A7S III
Sigma
BF (2025)
Starting from £1799 new
Best for Photographers who want to strip back every distraction
View BF
Sony
A7S III (2020)
Starting from £2999 new
Best for Professional video & low-light filmmaking
View A7S III
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.
Professional Video & Low-Light Filmmaking — A7S III (2020): If video is your primary discipline, the A7S III is the camera. 4K/120p at 10-bit in a weather-sealed body with a 9.44M dot EVF is an extraordinary package. The 12MP sensor isn't limiting for video — and it's usable at ISO 409,600 in a pinch.
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
A7S III (2020)
- Filmmakers and videographers who need 4K/120p at 10-bit
- Event videographers who shoot in dark venues regularly
- Documentary filmmakers who need reliable AF and weather sealing
- Hybrid shooters where video is primary and stills are secondary
Quick take: The bf has the highest resolution at 24mp; the bf is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | BF (2025) | A7S III (2020) |
|---|---|---|
| Price | £1,799 | £2,999 |
| Sensor | 24MP full-frame BSI CMOS | 12.1MP Full-Frame BSI CMOS (12-bit, back-illuminated) |
| Resolution | 24.0MP | 12.1MP |
| Video | 4K/30p, 1080p/60p | 4K/120p 10-bit, 4K/60p 10-bit S-Cinetone/S-Log3, 1080p/240p |
| Autofocus | Phase-detect AF — face and eye detection | Phase-detect, 759 points, real-time Eye AF (human & animal), subject recognition |
| Stabilisation | 5-axis IBIS — 7 stops | 5.5-stop IBIS |
| Burst Rate | 9fps electronic | 10fps mechanical |
| Battery Life | ~400 shots (CIPA) | ~600 shots (CIPA) / ~70min continuous 4K recording |
| Weight | 427g body only | 699g (body, battery, card) |
| Dimensions | 127.0 × 75.0 × 45.0mm | 128.9 × 96.9 × 80.8mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.75× 3.68M-dot | OLED EVF, 9.44M dots, 0.90× magnification — best EVF Sony has made |
| Screen | 3.15" fully articulating touchscreen — primary interface | 3.0" vari-angle touchscreen, 1.44M dots |
| Mount | L-mount (Leica/Panasonic/Sigma) | Sony E-mount |
| Memory Cards | Single UHS-II SD slot | Dual CFexpress Type A / SD UHS-II (both slots) |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C (USB 3.2 Gen 2), full-size HDMI, Wi-Fi 6, Bluetooth |
Suitability by genre
| Genre | BF | A7S III |
|---|---|---|
| Street | ||
| Travel | ||
| Portrait | ||
| Landscape | — | |
| Sports | — | |
| Vlogging & Video | — | |
| Video | — | |
| Wildlife | — |
More comparisons with BF
Camera family history