EOS R8vs Sigma fpvs A6400
Sigma
Sigma fp (2019)
From £1499
Best for Creative filmmakers & experimental photographers
View Sigma fp
Which should you buy?
Full-Frame Entry — EOS R8 (2023): Canon's most affordable full-frame mirrorless — 4K/60p 10-bit and class-leading Dual Pixel AF at an accessible entry price.
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.
Content Creation & Vlogging — A6400 (2019): The best value APS-C Sony you can buy — especially used. Real-time Eye AF at this price point was transformative when it launched and still makes it one of the most reliable autofocus systems in the lineup.
Who should buy what
EOS R8 (2023)
- You want full-frame image quality on a tight budget
- You shoot mainly in good light and can live without built-in stabilisation
- You primarily shoot stills with occasional video
Sigma fp (2019)
- You're a filmmaker building a cinema rig where the smallest full-frame body is essential
- You want L-mount compatibility to pair with Sigma Art or Leica SL lenses
- You prioritise video and cinema colour over stills ergonomics and functionality
A6400 (2019)
- Vloggers and content creators who need a flip screen and reliable AF
- Photographers upgrading from a compact or smartphone
- Beginners who want room to grow into a full E-mount lens ecosystem
- Anyone prioritising autofocus performance at an accessible price
Quick take: The sigma fp has the highest resolution at 25mp; the a6400 is the most affordable. Scroll down for the full spec breakdown.
Full specifications
| Specification | EOS R8 (2023) | Sigma fp (2019) | A6400 (2019) |
|---|---|---|---|
| Price | £1,099 | £1,499 | £899 |
| Sensor | 24.2MP Full-frame BSI CMOS | 24.6MP full-frame Bayer CMOS | 24.2MP APS-C Exmor CMOS BSI |
| Resolution | 24.2MP | 24.6MP | 24.2MP |
| Video | 4K/60p oversampled 10-bit, FHD/180p | 12-bit Cinema DNG RAW, 4K/24p, 1080p/120p | 4K/30p (6K oversampled, no crop), 1080p/120p slow-motion |
| Autofocus | Dual Pixel CMOS AF II, 1053 zones, eye/face/subject tracking | Contrast-detect AF with face/eye detection | Phase-detect, 425 points, real-time Eye AF & animal AF |
| Stabilisation | None (no IBIS) | None (lens-based only) | None (no IBIS) |
| Burst Rate | 6fps mechanical, 40fps electronic | 18fps electronic | 11fps mechanical, 8fps with AF tracking |
| Battery Life | ~220 shots (CIPA) | 200 shots (CIPA) | ~410 shots (CIPA) |
| Weight | 461g body only | 422g body only | 403g (body, battery, card) |
| Dimensions | 132.5 × 86.1 × 70.0mm | 112.6 × 69.9 × 45.3mm | 120.0 × 66.9 × 59.7mm |
| Weather Sealed | No | No | No |
| Viewfinder | EVF, 2.36M dots, 0.59× | None | EVF, 2.36M dots, 0.70× magnification |
| Screen | 3.0" fully articulating touchscreen | 3.15" fixed touchscreen | 3.0" tilting touchscreen, 180° flip for selfie/vlog, 921k dots |
| Mount | Canon RF mount (full-frame) | Leica L-mount | Sony E-mount |
| Memory Cards | Single SD UHS-II slot | Single SD UHS-II + CFexpress Type B (via adapter) | Single SD UHS-I |
| Connectivity | USB-C, Bluetooth, Wi-Fi | USB-C 3.1, Wi-Fi, Bluetooth | Micro-USB, Wi-Fi, Bluetooth, NFC |
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