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Thread: How? PI multi exposures times on the same Night.

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    Default How? PI multi exposures times on the same Night.



    Starting to get some decent results with PI. So i been going back thru collected data.
    When I was shooting M42 the other night I shot at 3 different exposure times. 90s, 120s,180s.
    I'm following LightVortex tutorial.(trying to).
    The tutorial says when processing different sessions from different nights .
    That you should process each nights photos to the point of the SubframeSelector process step setting weights and choosing best shots.
    Do each night. Then finish by Align/Register, ImagIntergration Stack ALL Nights,
    Apply Dizzle algorithim. for final image.

    Should I process each Exposure Time separatly? ending with 3 groups (just like seperate nights)
    Then Intergrate/Stack together ? into 1.
    or can i Stack All at the time?.
    I have tried to stack all 3 exposures using the longest Darks 180s as the Calibration Dark. and i get a desent image. (my shot of the Sword is processed this way) but not sure if thats get the best results with the ALL Stack.

    does it help to shoot M42 at different times to get a better Core? and then intergrate?
    or Not?

    thanks
    bj
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    Default Re: How? PI multi exposures times on the same Night.

    Process the times separately.
    Then use the HDR Composition tool
    https://pixinsight.com/forum/index.php?topic=2320.0
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    Default Re: How? PI multi exposures times on the same Night.

    Thanks.
    More reading,,,,
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    Default Re: How? PI multi exposures times on the same Night.

    If you intend to use HDR techniques, you should process each exposure time separately. PI is just fine with processing them all together, too, and that can give decent results.

    Having multiple exposure times is highly desirable on M42, because of its high dynamic range. I have combined multiple exposure times from 10 seconds to 10 minutes to get a decent image of it.
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