Ricoh / Pentax K-1 Mark II firmware v2.51

Ricoh / Pentax · First seen Jul 4, 2026

v2.51 is the latest firmware for the Ricoh / Pentax K-1 Mark II.

What's in this update

Improved accuracy of the star-tracking for Astrotracer shooting when “2 Type 2” is selected under Menu Item C, “6. Bulb（B）​Mode Options.” Improved stability for general performance.

  • When this update is done, the contents of version 2.50 and earlier will be also updated.
  • When this update is done, you will not be able to restore back to version 2.50 or earlier.
  • This firmware includes op​en-source software. The applicable licenses are described in the text files included in the download.

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