Sigma fpvs A7R III
Sigma
Sigma fp (2019)
Starting from £1499 new
Best for Creative filmmakers & experimental photographers
View Sigma fp
Sony
A7R III (2017)
Starting from £1799 new
Best for Landscape, studio & commercial photography
View A7R III
GearScore™ Verdict — Which should you buy?
Creative Filmmakers & Experimental Photographers — Sigma fp (2019): The smallest full-frame camera in the world — Cinema DNG RAW and L-mount flexibility in a pocket-sized body that rewards creative shooters.
Landscape, Studio & Commercial Photography — A7R III (2017): The camera that converted professionals to mirrorless — 42MP, IBIS, and 10fps in a body that still competes today.
Who should buy what
Sigma fp (2019)
- Filmmakers who want the world's smallest full-frame camera as a B or C camera
- Experimental photographers who want to build a unique, modular setup
- L-mount photographers who want an ultra-compact full-frame body
- Anyone who wants a conversation-starting camera that delivers serious results
A7R III (2017)
- Landscape and studio photographers who need 42MP resolution at a used-price discount vs A7R IV
- Canon/Nikon DSLR professionals considering a mirrorless switch at a lower investment
- Commercial and product photographers who want full-frame resolution with IBIS for handheld work
- Portrait photographers who want the sharpest possible full-frame files for large print work
Quick take: The a7r iii has the highest resolution at 42mp; the sigma fp is the most affordable; only the a7r iii is weather sealed. Scroll down for the full spec breakdown.
Full specifications
| Specification | Sigma fp (2019) | A7R III (2017) |
|---|---|---|
| Price | £1,499 | £1,799 |
| Sensor | 24.6MP full-frame Bayer CMOS | 42.4MP full-frame BSI Exmor R CMOS |
| Resolution | 24.6MP | 42.4MP |
| Video | 12-bit Cinema DNG RAW, 4K/24p, 1080p/120p | 4K/30p (full-frame readout), 1080p/120p |
| Autofocus | Contrast-detect AF with face/eye detection | 399 phase-detect + 425 contrast AF points — real-time Eye AF |
| Stabilisation | None (lens-based only) | 5-axis IBIS — 5.5 stops |
| Burst Rate | 18fps electronic | 10fps with AF/AE tracking |
| Battery Life | 200 shots (CIPA) | ~650 shots (CIPA) |
| Weight | 422g body only | 650g body only |
| Dimensions | 112.6 × 69.9 × 45.3mm | 126.9 × 95.6 × 73.7mm |
| Weather Sealed | No | Yes |
| Viewfinder | None | EVF, 3.69M dots, 0.78× magnification |
| Screen | 3.15" fixed touchscreen | 3.0" touchscreen, tilting |
| Mount | Leica L-mount | Sony FE mount (full-frame E-mount) |
| Memory Cards | Single SD UHS-II + CFexpress Type B (via adapter) | Dual SD slots (one UHS-II) |
| Connectivity | USB-C 3.1, Wi-Fi, Bluetooth | USB-C, Bluetooth, Wi-Fi, 3.5mm mic jack |
Suitability by genre
| Genre | Sigma fp | A7R III |
|---|---|---|
| Vlogging & Video | ||
| Street | ||
| Travel | — | |
| Portrait | ||
| Landscape | ||
| Sports & Action | — | |
| Wedding | — | |
| Sports | — |
More comparisons with Sigma fp
Camera family history