Pentax Imaging has released a firmware update for the flagship K-5 DSLR camera. This update is version 1.03 which addresses a low light focusing issue and provides better overall stability and general performance.
From the Pentax Japan site:
Changes to V1.03
- Improved the accuracy of auto focus in low-intensity light condition.
- Improved stability for general performance.
You can download this firmware update by navigating to this page and selecting the version that matches your computer’s operating system.