Iris Nebula - 3 Hours

Discussion in 'Astro Photography' started by Colorado CJ, Jun 11, 2019.

  1. Colorado CJ

    Colorado CJ Well-Known Member

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    Sunday night I shot the Iris nebula. I only shot a total of 3 hours, but like always, I get the itch to process what I shoot each night. That is one thing I need to work on, shooting a subject for at least 10 hours before processing the image. The closest I got so far is 4.5 hours or so [​IMG] .

    Anyway, this is what I got so far with the Iris Nebula.

    Skywatcher MN190 Mak Newt
    ZWO ASI 183MM Pro Imaging Camera
    Astrodon LRGB Filters
    EQ6-R Pro Equatorial Mount
    ZWO ASI120MC-S Guide Camera
    ZWO ASIAIR

    Luminance: 45 minutes
    Red: 45 minutes
    Green: 45 minutes
    Blue: 45 minutes

    [​IMG]
     
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  2. Ben Egbert

    Ben Egbert Forum Helper
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    My hat is off to you for your patience. 4.5 hours seems like an eternity for an exposure. I tried 5 minuets with my 5DSR for a milky way and got garbage for noise, even at a relatively low ISO. Do these camera have cooled sensors?

    Gorgeous image by the way.
     
  3. Colorado CJ

    Colorado CJ Well-Known Member

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    Yes, they can be cooled to 40C below ambient temperatures. I usually cool mine to -20C.

    These are 90 second exposures (total of 120 shots making 3 hours), though I have shot 10 minute exposures when using narrow band filters.
     
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  4. JimFox

    JimFox Moderator
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    Very cool Andrew. I like how this looks quite a bit.

    I think I would be processing these as I shot them too. I also don't think I could wait for the whole 10 hours. :)

    And... as a viewer I am enjoying seeing the progression as you work on these.
     
  5. AlanLichty

    AlanLichty Moderator

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    120 90 second images? How long does it take to process an image like this? Stunning result.
     
  6. Mike Lewis

    Mike Lewis Staff Member
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    Andrew,

    Love the color of the nebula in this one. Nice scale and great tracking it looks like too. A very small nit would be star colors. What was your gain? Wondering if the stars ended up being a bit saturated as not much color in any of the brighter stars, and the smaller stars all look to be yellowish. I also shoot with a 12 bit ASI camera and it is easy to saturate the stars depending on gain and subframe exposure times.

    ML
     

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