BFvs A7S
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.
Astrophotography & Low-Light — A7S (2014): The original A7S pioneered the concept of a camera optimised entirely for low light. Its 12.2MP sensor has enormous photosites — extraordinary high-ISO performance that still holds up. Lacking IBIS and limited to 1080p internally (4K requires external recorder), it is a specialist tool. For astrophotography, event videography, or any scenario where light is genuinely scarce, it remains outstanding.
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 (2014)
- Astrophotographers
- Low-light event videographers
- Filmmakers needing clean high-ISO footage
Quick take: The bf has the highest resolution at 24mp; the a7s is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | BF (2025) | A7S (2014) |
|---|---|---|
| Price | £1,799 | £600 |
| Sensor | 24MP full-frame BSI CMOS | 12.2MP Full-Frame BSI CMOS |
| Resolution | 24.0MP | 12.2MP |
| Video | 4K/30p, 1080p/60p | 1080p/60p internal, 4K via HDMI (external recorder) |
| Autofocus | Phase-detect AF — face and eye detection | Phase-detect / contrast-detect hybrid AF |
| Stabilisation | 5-axis IBIS — 7 stops | None |
| Burst Rate | 9fps electronic | 5fps |
| Battery Life | ~400 shots (CIPA) | ~370 shots (CIPA) |
| Weight | 427g body only | 474g (with battery and card) |
| Dimensions | 127.0 × 75.0 × 45.0mm | 126.9 × 94.4 × 48.2mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.75× 3.68M-dot | Electronic, 2.36M dots, 0.71× magnification |
| Screen | 3.15" fully articulating touchscreen — primary interface | 3.0" tilting LCD, 1.23M dots |
| Mount | L-mount (Leica/Panasonic/Sigma) | Sony FE (full-frame E-mount) |
| Memory Cards | Single UHS-II SD slot | Single SD / MemoryStick PRO Duo slot |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Multi/Micro USB, Wi-Fi, NFC |
Suitability by genre
| Genre | BF | A7S |
|---|---|---|
| Street | ||
| Travel | ||
| Portrait | ||
| Landscape | ||
| Sports | — | |
| Vlogging & Video | ||
| Astrophotography | — | |
| Sports & Action | — |
GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →
More comparisons with BF
Camera family history