BFvs A7R IV
Sigma
BF (2025)
Starting from £1799 new
Best for Photographers who want to strip back every distraction
View BF
VS
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.
Landscape, Studio, Commercial — A7R IV (2019): 61MP in a mirrorless body — the resolution benchmark.
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
A7R IV (2019)
- Landscape photographers who print large
- Studio shooters needing maximum detail
Quick take: The a7r iv has the highest resolution at 61mp; the bf is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | BF (2025) | A7R IV (2019) |
|---|---|---|
| Price | £1,799 | £2,199 |
| Sensor | 24MP full-frame BSI CMOS | Full-frame BSI Exmor R CMOS 35mm |
| Resolution | 24.0MP | 61.0MP |
| Video | 4K/30p, 1080p/60p | 4K 30fps |
| Autofocus | Phase-detect AF — face and eye detection | 567-point phase-detect, real-time tracking |
| Stabilisation | 5-axis IBIS — 7 stops | 5-axis IBIS, 5.5 stops |
| Burst Rate | 9fps electronic | 10fps |
| Battery Life | ~400 shots (CIPA) | 670 shots (CIPA) |
| Weight | 427g body only | 665g (body only) |
| Dimensions | 127.0 × 75.0 × 45.0mm | 128.9 × 96.4 × 77.5mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.75× 3.68M-dot | EVF 0.78× 5.76M-dot |
| Screen | 3.15" fully articulating touchscreen — primary interface | 3.0" tilting touchscreen, 1.44M-dot |
| Mount | L-mount (Leica/Panasonic/Sigma) | Sony E-Mount |
| Memory Cards | Single UHS-II SD slot | 2× SD UHS-II / CFexpress Type A |
| Connectivity | USB-C, Wi-Fi, Bluetooth | Wi-Fi 5GHz, Bluetooth 4.1, USB-C 3.2 |
Suitability by genre
| Genre | BF | A7R IV |
|---|---|---|
| Street | ||
| Travel | ||
| Portrait | ||
| Landscape | ||
| Sports | — | |
| Vlogging & Video | ||
| Architecture | — | |
| Wedding & Events | — | |
| Wildlife | — |
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