Current Development Stage:

• Sigma is still in the pixel architecture design phase and has not yet begun fabricating the full sensor prototype. This involves second-round test-wafer runs to evaluate small-scale prototypes with reduced pixel counts.
• Yamaki emphasizes that Sigma has “never designed a sensor by ourselves before,” highlighting the in-house challenges since acquiring Foveon in 2008. Previous Foveon sensors were co-developed, but this full-frame version is a from-scratch effort.

Technical Innovations and Improvements:

• The new sensor aims for a full-frame (35mm) format with a stacked back-side illuminated (BSI) structure and on-chip phase-detect autofocus—features absent in older Foveon designs like the SD1 Merrill (2011) or Quattro series (2014-2016).
• It retains the X3 1:1:1 layered architecture (equal pixel counts per RGB layer, unlike the 1:1:4 ratio in Quattro sensors), promising better dynamic range, color fidelity, and resolution (potentially 60MP effective).
• Yamaki discusses crosstalk between RGB layers as a unique strength, enabling “distinct color gradation” that outperforms Bayer sensors in studio, landscape, and portrait work.

Challenges and Delays:

• Development, first teased in 2018, has faced repeated setbacks, including ending a partnership with a sensor manufacturer, requiring a restart. As of October 2025, it’s “almost at the final stage of technology development” but not ready for mass production.
• Key hurdles include power consumption, heat dissipation (due to three analog-to-digital converters), and achieving “perfect” pixel performance. Yamaki states they won’t proceed to production until issues are fully resolved: “The Foveon chip will appear when the pixel is perfect.”
• No video capabilities are mentioned for the initial release, as early Foveon sensors struggled with even low-res video (e.g., 480p on DP series).

Future Outlook and Commitment:

• Sigma remains dedicated, viewing Foveon as a “niche but valuable” technology for enthusiasts seeking ultimate image quality over high-volume sales. It could integrate into future Sigma fp mirrorless cameras (e.g., a “fp X3” variant).
• Yamaki expresses optimism: “Technical problems have been narrowing down,” and once confident, they’ll move to full sensor design and production. However, no timeline is given—explicitly not in 2025, and possibly 2026 or later.
• The video touches on broader philosophy: Sigma’s “beautiful foolishness” in pursuing innovative, non-mainstream tech like Foveon, despite market trends favoring Sony/ Canon sensors.

Sigma still committed to Foveon, they are now almost at the final stage of technology development

Sigma CEO: the Foveon X3 full-frame mirrorless camera will not be coming this year (2025)

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