Panasonic announced that a new firmware update for its Lumix DC-S1: $2,497.99 at Amazon, B&H, Adorama and Lumix DC-S1R: $3,697.99 at Amazon, B&H, Adorama full-frame mirrorless cameras.

The new firmware (version 1.1) will be available on July 9th and addresses the following image stabilization performance, Panasonic claims that with firmware v1.1, the in-body IS system will reduce shake by an additional 1/2-stop, for a total of 6 stops with non-stabilized lenses and 6.5 stops with Dual IS-compatible glass.
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https://www.dailycameranews.com/2019/07/new-firmware-version-1-1-announced-for-panasonic-s1-s1r/