The Panasonic LEICA DG VARIO-SUMMILUX 25-50mm F1.7 ASPH is a standard zoom lens for Micro Four Thirds with a constant ultra-bright F1.7 maximum aperture, covering 50-100mm full-frame equivalent. It features a 9-blade circular iris, weather-sealing, and LEICA-certified optical quality. The lens is part of the premium LEICA DG VARIO-SUMMILUX series.
Product released: November 25, 2021
Latest firmware version
Version 1.2, released June 18, 2024
Last checked for updates: Oct 31, 2026 15:51 UTC
What's new in version 1.2
Improved AF performance while zooming.
- Compatible products as of Jun. 18, 2024 : DC-G9M2, DC-GH7
Improved operational stability.
LatestUpdate has tracked 2 versions of Panasonic LEICA DG 25-50mm F1.7 (H-X2550) firmware, released between March 1, 2022 and June 18, 2024.
Version 1.2 - June 18, 2024: Improved AF performance while zooming. - Compatible products as of Jun. 18, 2024 : DC-G9M2, DC-GH7 Improved operational stability.
Version 1.1 - March 1, 2022: It is possible to control AF operation by pressing the shutter button halfway, or by pressing the AF-ON button, when [200.00p] is set in high frame rate video…
What is Panasonic LEICA DG 25-50mm F1.7 (H-X2550)?
The Panasonic LEICA DG VARIO-SUMMILUX 25-50mm F1.7 ASPH is a standard zoom lens for Micro Four Thirds with a constant ultra-bright F1.7 maximum aperture, covering 50-100mm full-frame equivalent. It features a 9-blade circular iris, weather-sealing, and LEICA-certified optical quality. The lens is part of the premium LEICA DG VARIO-SUMMILUX series. It was originally released on November 25, 2021.
What is the latest firmware version of Panasonic LEICA DG 25-50mm F1.7 (H-X2550)?
The latest firmware version of Panasonic LEICA DG 25-50mm F1.7 (H-X2550) is 1.2. It was released on June 18, 2024.
What changed in Panasonic LEICA DG 25-50mm F1.7 (H-X2550) firmware version 1.2?
Panasonic LEICA DG 25-50mm F1.7 (H-X2550) firmware version 1.2 includes the following changes: Improved AF performance while zooming.
- Compatible products as of Jun. 18, 2024 : DC-G9M2, DC-GH7
Improved operational stability.
Where can I download the latest Panasonic LEICA DG 25-50mm F1.7 (H-X2550) firmware?
Details and download instructions for the latest Panasonic LEICA DG 25-50mm F1.7 (H-X2550) firmware (version 1.2) are on Panasonic's official release page: https://av.jpn.support.panasonic.com/support/global/cs/dsc/download/fts/dl/x2550.html
How often does Panasonic release firmware updates for Panasonic LEICA DG 25-50mm F1.7 (H-X2550)?
We have tracked 2 firmware versions of Panasonic LEICA DG 25-50mm F1.7 (H-X2550).