BFvs A7 IV
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.
Portrait & Wedding Photography — A7 IV (2021): The full-frame portrait benchmark — 33MP, AI Eye AF, and exceptional skin-tone rendering in a pro-grade hybrid body.
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 IV (2021)
- Working photographers who want a reliable full-frame all-rounder
- Portrait, wedding, and event photographers needing 33MP and fast AF
- A7 III owners ready for a major upgrade in resolution, AF, and video
- Hybrid shooters who want 4K/60p and 33MP stills in one dependable body
Quick take: The a7 iv has the highest resolution at 33mp; the bf is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | BF (2025) | A7 IV (2021) |
|---|---|---|
| Price | £1,799 | £2,299 |
| Sensor | 24MP full-frame BSI CMOS | 33MP Full-frame BSI Exmor R CMOS |
| Resolution | 24.0MP | 33.0MP |
| Video | 4K/30p, 1080p/60p | 4K/60p oversampled, 10-bit internal, S-Log3, S-Cinetone |
| Autofocus | Phase-detect AF — face and eye detection | 759-point phase-detect, AI subject recognition |
| Stabilisation | 5-axis IBIS — 7 stops | 5-axis IBIS, 5.5 stops |
| Burst Rate | 9fps electronic | 10fps mechanical, 30fps electronic |
| Battery Life | ~400 shots (CIPA) | ~580 shots (CIPA) |
| Weight | 427g body only | 659g body only |
| Dimensions | 127.0 × 75.0 × 45.0mm | 131.3 × 96.4 × 79.8mm |
| Weather Sealed | Yes | Yes |
| Viewfinder | EVF 0.75× 3.68M-dot | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.15" fully articulating touchscreen — primary interface | 3.0" vari-angle touchscreen |
| Mount | L-mount (Leica/Panasonic/Sigma) | Sony FE (full-frame E-mount) |
| Memory Cards | Single UHS-II SD slot | Dual slots: CFexpress Type A + SD UHS-II |
| Connectivity | USB-C, Wi-Fi, Bluetooth | USB-C (3.2 Gen 2), Bluetooth, Wi-Fi |
Suitability by genre
| Genre | BF | A7 IV |
|---|---|---|
| Street | — | |
| Travel | — | |
| Portrait | — | |
| Landscape | ||
| Sports | — | |
| Vlogging & Video | ||
| Studio Portraits | — | |
| Outdoor Portraits | — | |
| Wedding & Events | — | |
| Sports & Action | — |
GearScore™ suitability scores are based on aggregated purchaser reviews weighted by photography genre. See how scores are calculated →
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Camera family history