Sigma Patent Discovered: Ultra-Fast 24mm f/1.2 and 28mm f/1.2 Lenses on the Horizon?
Sigma is no stranger to pushing the boundaries of optical design, especially when it comes to their acclaimed Art series for full-frame mirrorless cameras. A newly uncovered patent (JP2025-167449) reveals that Sigma is actively exploring some incredibly fast wide-angle prime lenses: a 24mm f/1.2 and a 28mm f/1.2.
For Sony E-mount shooters, this is highly exciting news. We already have the massive but optically stellar Sigma 35mm f/1.2 DG DN Art. Extending that ultra-fast f/1.2 aperture to wider focal lengths would be a dream for low-light event photography, environmental portraiture, and especially astrophotography, where gathering every possible photon is critical.
Patent Details: JP2025-167449
Looking at the optical formulas from the patent literature, both the 24mm and 28mm designs share a highly complex, glass-heavy structure typical of modern mirrorless lens design.
- Focal Lengths: 24mm and 28mm
- Maximum Aperture: f/1.2
- Optical Design: The diagrams show a substantial number of elements with large front groups and elements positioned very close to the rear mount. This indicates these will likely be premium, heavy-duty “Art” series lenses specifically engineered to suppress optical aberrations wide open.
- Target System: While patents generally represent optical formulas rather than final retail products, Sigma’s DN mirrorless designs almost universally make their way to Sony E-mount.
The 24mm f/1.2 would go head-to-head with lenses like Sony’s own 24mm f/1.4 GM, offering an extra half-stop of light-gathering capability, albeit almost certainly at the cost of a larger size and heavier weight.
The 28mm f/1.2 is a particularly interesting proposition. The 28mm focal length has seen a major resurgence in popularity for street and documentary photography, and an f/1.2 option would be highly unique in the current native E-mount lineup.
Would you prefer the wider 24mm or the classic 28mm field of view for a massive f/1.2 prime? Let us know in the comments below!
via j-platpat