# Sony Alpha A7 IV vs Sigma BF: specs and price compared

A sourced, side-by-side comparison of the Sony Alpha A7 IV (Sony) and Sigma BF (Sigma) among mirrorless cameras. Sigma BF is the cheaper of the two at $1999.

## Side by side

| 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 |

## Key differences

- 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 Yes 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

**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.)

## Sources

- Sony Alpha A7 IV: https://www.imaging-resource.com/PRODS/sony-a7-iv/sony-a7-ivA.HTM (imaging-resource.com, verified 2026-06-15)
- Sigma BF: https://www.newsfilecorp.com/release/242056/Introducing-the-Radically-Simple-Sigma-BF-Camera (newsfilecorp.com, verified 2026-08-26)

Canonical: https://frontdeskreview.com/gear/mirrorless-cameras/sony-a7-iv-vs-sigma-bf/
Cite: Per The Front Desk Review, Sony Alpha A7 IV ($2499) vs Sigma BF ($1999) — sourced spec-by-spec comparison at https://frontdeskreview.com/gear/mirrorless-cameras/sony-a7-iv-vs-sigma-bf/
License: CC BY 4.0.