The Panasonic LEICA DG VARIO-ELMAR 100-400mm F4.0-6.3 II ASPH is the second-generation super-telephoto zoom for Micro Four Thirds, offering 200-800mm full-frame equivalent reach with improved Dual I.S. compatibility and nano surface coating. It features dual Power O.I.S. and a refined optical design for better corner sharpness. The lens belongs to the premium LEICA DG VARIO-ELMAR telephoto series.
Product released: February 24, 2022
Latest firmware version
Version 1.1, released May 14, 2025
Last checked for updates: Oct 31, 2026 03:59 UTC
What's new in version 1.1
Improved operational stability when combined with certain cameras of other companies.
What is Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400)?
The Panasonic LEICA DG VARIO-ELMAR 100-400mm F4.0-6.3 II ASPH is the second-generation super-telephoto zoom for Micro Four Thirds, offering 200-800mm full-frame equivalent reach with improved Dual I.S. compatibility and nano surface coating. It features dual Power O.I.S. and a refined optical design for better corner sharpness. The lens belongs to the premium LEICA DG VARIO-ELMAR telephoto series. It was originally released on February 24, 2022.
What is the latest firmware version of Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400)?
The latest firmware version of Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400) is 1.1. It was released on May 14, 2025.
What changed in Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400) firmware version 1.1?
Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400) firmware version 1.1 includes the following changes: Improved operational stability when combined with certain cameras of other companies.
Where can I download the latest Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400) firmware?
Details and download instructions for the latest Panasonic LEICA DG 100-400mm F4.0-6.3 II (H-RSA100400) firmware (version 1.1) are on Panasonic's official release page: https://av.jpn.support.panasonic.com/support/global/cs/dsc/download/fts/dl/rsa100400.html