Sony
Sony Alpha A7 IV
$2499
Released 2021-12
Best Mirrorless Cameras · head-to-head
Sony Alpha A7 IV vs Sigma BF
A sourced, side-by-side comparison. Sigma BF is cheaper at $1999. Every spec and price links to its source.
Sigma
Sigma BF
$1999Cheaper
Released 2025-04
Which is better: the Sony Alpha A7 IV or Sigma BF?
They split the 2 specs we compare evenly. The Sigma BF is the cheaper at $1999.
As an Amazon Associate we earn from qualifying purchases. Prices verified at capture; live price may differ.
Key specs, head to head
The numbers that decide it, drawn to scale — longer bar wins, the accent bar is the stronger figure.
Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Sony Alpha A7 IV | Sigma BF |
|---|---|---|
| US price | $2499 | $1999 |
| Brand | Sony | Sigma |
| Released | 2021-12 | 2025-04 |
| Sensor format | Full-frame | Full-frame (BSI CMOS) |
| Megapixels | 33 | 24.6 |
| Max video | 4K@60p | 6K30p |
| Ibis | Yes | No |
| Mount | Sony E | L-Mount |
| Continuous (fps) | 10 | 8 |
| Weight (g) | 658 | 446 |
| Release | 2021-12 | 2025-04 |
Sources — Sony Alpha A7 IV: imaging-resource.com (verified 2026-06-15). Sigma BF: newsfilecorp.com (verified 2026-08-26).
What's the difference between the Sony Alpha A7 IV and Sigma BF?
Where the two actually differ on the specs we track (7 of 7). Matching specs are omitted.
- Sensor format: Sony Alpha A7 IV Full-frame vs Sigma BF Full-frame (BSI CMOS)
- Megapixels: Sony Alpha A7 IV 33 vs Sigma BF 24.6
- Max video: Sony Alpha A7 IV 4K@60p vs Sigma BF 6K30p
- Ibis: Sony Alpha A7 IV true vs Sigma BF No
- Mount: Sony Alpha A7 IV Sony E vs Sigma BF L-Mount
- Continuous (fps): Sony Alpha A7 IV 10 vs Sigma BF 8
- Weight (g): Sony Alpha A7 IV 658 vs Sigma BF 446
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Sony Alpha A7 IV
Two whitelisted hands-on reviews (TechRadar, Engadget) survived verification and agree the A7 IV is the best all-round hybrid mirrorless of its era: class-leading autofocus, strong 33MP stills and oversampled 10-bit 4:2:2 4K video. Both flag pronounced rolling shutter with the electronic shutter, a cropped Super 35 4K/60p mode, a price increase over the A7 III, and merely-average 10fps burst. All quotes are verbatim in the source text and all measured values are supported. (2 sourced reviews, 2 lab-tested.)
Praised: Class-leading autofocus with reliable subject/eye tracking for stills and video; Powerful hybrid video: oversampled 4K with 10-bit 4:2:2 color; Strong high-ISO/low-light performance and accurate out-of-camera color.
Flagged: Pronounced rolling shutter with the electronic/silent shutter; 4K/60p only available with a cropped Super 35 (APS-C) mode; Price hike over the A7 III (~$500 per Engadget; ~20-30% per TechRadar).
Sigma BF
No sourced tester review yet.