[jawats]

It doesn't support Astrotracer without the 0-GPS1 though.

It will do astro type 3 without GPS, however.

[slartibartfast01]

It will do astro type 3 without GPS, however.

It didn't in September though

[jawats]

It didn't in September though

True. That came in December:

Astro Tracer Type3 is a mode that realizes an Astro Tracer without using GPS or electronic compass information. It is said that astronomical tracking will be performed from the movement of stars in the preliminary shooting performed before shooting, so there is no need to wait for GPS positioning or precision calibration, and it is possible to shoot even in places affected by magnetism. It is recommended to use O-GPS1 for starscape photography using a wide-angle lens.

Read more: New beta firmware updates for Pentax K-1, K-1 Mark II, and K-3 Mark III cameras - Pentax Rumors

[slartibartfast01]

True. That came in December:



Astro Tracer Type3 is a mode that realizes an Astro Tracer without using GPS or electronic compass information. It is said that astronomical tracking will be performed from the movement of stars in the preliminary shooting performed before shooting, so there is no need to wait for GPS positioning or precision calibration, and it is possible to shoot even in places affected by magnetism. It is recommended to use O-GPS1 for starscape photography using a wide-angle lens.



Read more: New beta firmware updates for Pentax K-1, K-1 Mark II, and K-3 Mark III cameras - Pentax Rumors

Yes it looks impressive.

[JohnI]

I've gotten good astrophoto results from this now-discontinued lens. Needs to be stopped down a bit for good star images. The attached shot of the heart of the Milky Way (Scutum-Sagittarius-Scorpius) on my K5 was 250 seconds at f2.2. From DNG camera raw file. Camera mounted on an iOptron SkyTracker. Location: Puako on the Big Island.