Sigma GF 24mmF2 Lens Patent for Fujifilm GFX

Back in 2023, Sigma’s CEO said that Fujifilm GFX users would be their ideal customers, while also making it clear that Sigma had no plans to produce G-mount lenses at the time.

• “Fujifilm GFX Users Would be Our Ideal Customers, but so far No Sigma GFX lenses Planed”

Then in 2024, the tone changed. Sigma’s CEO stated that if Sigma truly wants to become the “master of optics,” it would eventually need to make lenses for the Fujifilm GFX system.

• Sigma CEO: “We Need to Make Really Good Lenses for Fujifilm GFX to Become the Master of Optics”

That statement raised expectations that Sigma GFX lenses could arrive sooner rather than later. However, in 2025, the message shifted once again: Sigma currently has no concrete plans, and GFX lenses are something that might happen “maybe in the distant future.”

• Sigma CEO Dreams of Making Lenses for GFX, but Currently Not Planed (Maybe in Distant Future)

So, what’s the situation now?

A newly surfaced Sigma patent may provide a small but interesting clue.

The patent describes an optical design for a 24mm f/2 lens that appears to cover a sensor larger than full frame. Based on the technical specifications, the Japanese website Asobinet speculates that this design could be intended for Fujifilm GFX (44×33mm).

And the fact that Sigma is even investigating and patenting optical designs for GFX-sized sensors is noteworthy.

It suggests a few things:

• The GFX system’s market share is growing, possibly approaching a point where Sigma sees long-term potential
• There likely isn’t any “mount protection” preventing third-party manufacturers from producing G-mount lenses, meaning Fujifilm appears open to external lens makers

These are undeniably positive signals.

However, a strong reality check is needed. Over the years, I’ve shared hundreds of patents on FujiRumors. Only once did I spot a patent before it turned into a real, shipping product. In all other cases, patents either surface after a product is announced—or never materialize at all.

We’ve seen this countless times:

• The Future of Fujifilm in Patents: Full Frame Lenses Coming, X100 with 20mmF2 lens, Foldable Fuji Smartphone and More

So while today’s Sigma patent is encouraging—especially because it shows third-party interest in the G mount—it does not mean Sigma GFX autofocus lenses are just around the corner.

For now, this is best seen as a first signal, not a promise. The road to third-party G-mount AF lenses may still be long—or may never happen at all.

Patent Details

Focal length: 23.49
F value: 2.20
Half-angle: 103.71
Statue height: 27.39
Total length: 157.04
Back focus: 29.9233