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Panasonic Lumix S9 Firmware 2.1 Expands Lens Fn Button Functions

digital · 2026-09-16

Panasonic has announced the release of firmware version 2.1 for its Lumix S9 camera, alongside a new Lumix S 20mm f/2.5 lens. Additionally, minor updates for other Lumix models have been introduced, along with upgraded versions of the Lumix Lab and Lumix Flow applications. Notably, users can now customize the Fn buttons on Lumix S lenses, including the freshly launched 20mm lens, to control functions like Aspect Ratio and electronic stabilization for videos. This comprehensive update will be available starting October 13 at 1 AM UTC, enhancing the capabilities of the S9, which debuted earlier in 2024.

Key facts

  • Lumix S9 firmware version 2.1 adds more assignable functions to Lumix S Lens Fn buttons, including the new Lumix S 20mm f/2.5 lens button.
  • Assignable functions include Aspect Ratio, E-Stabilization (Video), Boost I.S. (Video), Image Area of Video, Focus Ring Control, Focus Limiter, Hybrid Zoom, Crop Zoom, Focus Peaking, and Video Record.
  • Firmware 2.1 introduces MP4 (Lite) recording up to 4Kp60 and 1080p120 with 4:2:0 10-bit color and about half the file size of standard MP4.
  • The Lumix S9 launched in early 2024 and has been improved by later firmware and compact lenses such as the 18-40mm f/4.5-6.3.
  • Updates for Lumix S1R II, S1 II, S1 IIN, and S1 IIE target shutter-release responsiveness and burst shooting with external flash units, plus operational stability.
  • Lumix Lab Version 3.1.1 supports MP4 (Lite) on the S9 and adds a LUT category filter, themed downloadable LUT Packs, and an improved interface.
  • Lumix Flow Version 1.7.0 adds Lumix S9 support; the app provides storyboarding, scripting, and external monitor functions.
  • All firmware and app updates are expected on October 13 at 1 AM UTC.

Entities

Institutions

  • Panasonic
  • Lumix
  • PetaPixel

Sources