HighStackPro and subexposure registration?

Discussion in 'Guiding and Adaptive Optics - StarChaser and AO' started by Mark Manner, Feb 20, 2022.

  1. Mark Manner

    Mark Manner Cyanogen Customer

    Joined:
    Oct 31, 2014
    Messages:
    81
    Location:
    Nashville, TN USA
    Hi, when using HighStackPro for a long exposure, does HighStackPro register the subexposures it is taking behind the scenes before combining and presenting the stacked image? I assume it does not, but I was curious about it, since if it were registering the subs, it would allow for long exposures to be taken unguided, since you actually are taking shorter ones that might be within your mount's unguided capability.
    Best,
    Mark
     
    Mark Manner, Feb 20, 2022
    #1
  2. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    10,316
    No, StackPro does not do any registration. It simply turns a bunch of shorter exposures into one longer exposure.

    Registering would also make it pretty much impossible to calibrate the raw images.

    You could just take a series of short exposures all night. The only problem is the 30 gigabytes of disk space you'd use every night!
     
    Doug, Feb 20, 2022
    #2
  3. Mark Manner

    Mark Manner Cyanogen Customer

    Joined:
    Oct 31, 2014
    Messages:
    81
    Location:
    Nashville, TN USA
    That makes sense and is what I thought was the case. Thanks Doug.
     
    Mark Manner, Feb 20, 2022
    #3
  4. Tim Povlick

    Tim Povlick Cyanogen Customer

    Joined:
    May 8, 2020
    Messages:
    331
    Location:
    Kayenta Utah, USA

    Been there. Accidentally set automation to capture a 15 second Trapezium to "capture until stopped" instead of xx images. Woke up to find 100's of images. Kept some but deleted majority.
     
    Tim Povlick, Feb 20, 2022
    #4
    Mark Manner likes this.
  5. rockenrock

    rockenrock Cyanogen Customer

    Joined:
    Mar 12, 2015
    Messages:
    58
    Hi Doug,
    Very interesting discussions about StackPro. Strongly considering it for my next camera purchase.
    Is there a readout noise for each of the StackPro subs plus one when the image is downloaded, or just one for the stacked the image when it is downloaded?
    I know Cmos has very low readout noise compared to CCD, but if each internal sub has it, it can add up.

    Thanks for your comments.

    Roger
     
    rockenrock, May 2, 2022
    #5
  6. Doug

    Doug Staff Member

    Joined:
    Sep 25, 2014
    Messages:
    10,316
    @rockenrock you only get added read noise each time the sensor is read. Downloading is entirely digital and does not impact noise in any way.

    Depending on the sensor model and readout noise, the total read noise will be less than or equal to a comparable CCD sensor.
     
    Doug, May 2, 2022
    #6

Share This Page