Pentax K-1 firmware update version 1.40 released

The previously reported firmware update version 1.40 for the Pentax K-1 camera is now officially released. Here are the details:

Red-Lighted LCD Monitor Display Function

  • The PENTAX K-1 provides a red-lighted LCD monitor display function, which prevents the pupils of the photographer’s eyes from constricting after they have become accustomed to a dark environment during astrophotography.

Bulb Timer Function

  • The bulb timer function comes in handy when photographing celestial bodies or fireworks. The PENTAX K-1 allows the photographer to expand the exposure time up to 20 minutes in Bulb mode.


  • During slow shutter speeds the PENTAX K-1 features white dot noise reduction processsing.*
  • Overall Improved stability for general performance.

* When Slow Shutter Speed NR is OFF and JPEG image.

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  • Amazing disappointing that Pentax is only fixing the white dot issue on in camera jpg output. I noted the problem as soon as I shot with the K1, and noted it to Pentax, via both emails and calls to their support line. The fact that the issue is the same problem that the D810 had 2 years previously is most concerning. It was and is a well known problem with longer exposures with the 2nd generation of the Sony 36MP sensor.

    This is HUGELY short sighted and point to me that Pentax must not really understand the needs of astro photographers as jpg output is much less malleable in post and thus limits your final image.

    This issue should have been caught in beta testing, and fixed then. If they did catch it and decided that the best fix was LENR, again a huge oversight by Pentax and again points to their lack of understanding of this form of photography. LENR is both wasteful and takes up way too much time for stacking work or even Milky Way/astro bodies work.

    Nikon caught this early on in 2014, and issues a formal fix, that allowed much cleaner images in raw. Pentax, well so far all they have done is make a fix to in camera jpgs……worthless and disappointing.

    By issuing the firmware, Pentax is admitting that the problem exists. They need to recall the bodies effected and make a formal fix to them. Some european photographers have sent their K1’s to local non Pentax service centers and have gotten mixed results. As the fix appears to be a formal re-calibration of the sensor, I have little faith that Precision Camera (the US Pentax service center) can make this level of a fix.

    Paul Caldwell

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