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Forum: Pentax K-1 10-14-2018, 04:08 AM  
K-1ii white dot issue ?
Posted By biz-engineer
Replies: 18
Views: 1,443
Dark current noise is a fact of all sensors. It is more or less prominent depending on the sensor. Dark frame subtraction has been a regular technique since digital cameras are used, it's not a "problem" of Pentax K1 or Pentax K1 II, it's something we have to consider for the making of night sky photographs. White dots are on the K1 and K1II and all cameras using the same sensor (Nikon, Sony..), they do appear when pushing ISO and exposure time. Ten minutes exposure time is very long... I use 2 minutes exposures at ISO1600 at dark sites , f2.8, means your aperture was f5.6 in the example shot (why no aperture value in the exif?). If you need to expose for 10 minutes, means you have a slow lens for night sky photography, and so stacking multi-exposures is the cheap option at the expense of spending more time for the post processing.
Forum: Pentax K-1 10-14-2018, 01:43 AM  
K-1ii white dot issue ?
Posted By biz-engineer
Replies: 18
Views: 1,443
In order to get a nice clean gray frame, the 10 minutes exposure would consist of stacking 10 exposures of 1 minute each, with any camera of any brand, or get a lens with larger aperture so that to shorten the exposure time or reduce the ISO setting. That's how most people do for night sky photography.
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