In the latest Pentax K-3 Mark III firmware update version 1.41 Ricoh added support for the Astro Tracer Type 3 (see PDF file). Additional information is available on this website.
New Pentax K-1, K-1 II, and K-3 III firmware updates released
Pentax K-3 Mark III firmware version 1.41 Astro Tracer Type3 additional information
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