Sigma BF vs Sony a7C II
The bottom line
These two are closely matched. The differences below are where they diverge — weigh the ones that map to how you actually shoot, and let price and handling break the tie.
Choose the Sigma BF if…
- ✓You shoot in low light or indoors — a higher native ISO ceiling (102,400) gives it the edge after dark.
Choose the Sony a7C II if…
- ✓You shoot video seriously — it brings smoother 60p 4K vs 30p and both mic and headphone jacks for monitored audio.
- ✓You want maximum detail for landscapes, studio or large prints — 33MP resolves noticeably more than 24.6MP and gives more cropping latitude.
- ✓You photograph moving subjects — it adds AF subject detection for animals and vehicles that the other body lacks.
- ✓You shoot handheld — in-body stabilisation lets you use slower shutter speeds and steadies video, which the other body can't do without a stabilised lens.
Where they differ
- ›Video: the Sony a7C II is the stronger video tool — 4K up to 60p, 10-bit internal and Log.
- ›Price: the Sigma BF launched at $1,999, $200 under the Sony a7C II — money that could go toward glass.
- ›Stabilisation: only the Sony a7C II has in-body IS — slower handheld shutter speeds and steadier video without relying on stabilised lenses.
- ›Weight: the Sigma BF is 446g (15.7 oz) vs 514g (1.13 lb) — 68g you'll feel on a long day out.
- ›Resolution: 33MP on the Sony a7C II vs 24.6MP — more detail and crop room, at the cost of larger files.
- ›Burst: the Sony a7C II shoots 10fps to the Sigma BF's 8fps — the gap that decides whether you nail the peak moment in sports and wildlife.
Frequently asked
Is the Sigma BF or the Sony a7C II better?
These two are closely matched. The differences below are where they diverge — weigh the ones that map to how you actually shoot, and let price and handling break the tie.
Who should choose the Sigma BF?
Choose the Sigma BF if you shoot in low light or indoors — a higher native ISO ceiling (102,400) gives it the edge after dark.
Who should choose the Sony a7C II?
Choose the Sony a7C II if you shoot video seriously — it brings smoother 60p 4K vs 30p and both mic and headphone jacks for monitored audio. Choose it if you want maximum detail for landscapes, studio or large prints — 33MP resolves noticeably more than 24.6MP and gives more cropping latitude. Choose it if you photograph moving subjects — it adds AF subject detection for animals and vehicles that the other body lacks. Choose it if you shoot handheld — in-body stabilisation lets you use slower shutter speeds and steadies video, which the other body can't do without a stabilised lens.
What is the main difference between the Sigma BF and the Sony a7C II?
Video: the Sony a7C II is the stronger video tool — 4K up to 60p, 10-bit internal and Log.
| Product | ||
|---|---|---|
| Imaging | ||
| Sensor Type | BSI CMOS | BSI CMOS |
| Sensor Size | Full-Frame | Full-Frame |
| Image Processor | − | BIONZ XR |
| Effective Resolution | 24.6 MP | 33 MP |
| Lens Mount | Leica L | Sony E |
| Exposure Control | ||
| ISO Range (Native) | 100 – 102400 | 100 – 51200 |
| ISO Range (Extended) | − | 50 – 204800 |
| Mechanical Shutter | − | 1/4000 |
| Electronic Shutter | 1/25600 | 1/8000 |
| Flash Sync Speed | − | 1/160 |
| Built-in Flash | No | No |
| Still Image Capture | ||
| Continuous Shooting | 8 fps | 10 fps |
| Video Capture | ||
| Max Resolution | 6K | 4K |
| 8K Recording | − | − |
| 4K Recording | Up to 30p | Up to 60p |
| 1080p Recording | Up to 120p | Up to 120p |
| 10-bit Internal | Yes | Yes |
| Recording Limit | No limit | No limit |
| Log Profiles | Sigma Log | S-Log3 / HLG / S-Cinetone |
| Built-in Mic | Mono | Stereo |
| Headphone Jack | No | Yes |
| Mic Input | No | Yes |
| HDMI Output | − | Micro (Type D) |
| Focus | ||
| Phase Detect Points | 1,215 | 759 |
| Contrast Detect Points | − | − |
| Low Light AF | − | -4 EV |
| Eye AF | Yes | Yes |
| Animal AF | No | Yes |
| Vehicle AF | No | Yes |
| Viewfinder | ||
| EVF Type | − | OLED |
| EVF Resolution | − | 2.36M dots |
| EVF Magnification | − | 0.7x |
| Monitor | ||
| LCD Size | 3.2" | 3" |
| LCD Resolution | 2.10M dots | 1.04M dots |
| LCD Type | Fixed | Vari-Angle |
| Touch Screen | Yes | Yes |
| Interface | ||
| Wi-Fi | Wi-Fi | Wi-Fi 5 |
| Bluetooth | − | v5 |
| USB | USB-C | USB-C 3.2 |
| Memory Card Slots | None (230GB internal storage) | 1x SD UHS-II |
| GPS | No | No |
| General | ||
| Price (MSRP) | $1,999 | $2,199 |
| Body Material | Aluminum (unibody) | Magnesium Alloy |
| Dimensions | 130.1×72.8×36.8 mm | 124×71.1×63.4 mm |
| Weight | 446g (15.7 oz) | 514g (1.13 lb) |
| Weather Sealed | Yes | Yes |
| In-Body Stabilization | No | Yes |
| Battery Life (EVF) | − | 530 shots |
| Battery Life (LCD) | 260 shots | 560 shots |
| Battery Type | BP-81 | NP-FZ100 |
