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  1. #1
    seal killer's Avatar
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    Default NGC 7000; North America Nebula (11/6/10)



    All--

    I re-imaged NGC 7000, the North America nebula, last night. (It is commonly and mistakenly often referred to as the North American nebula.) I had imaged it previously, but could never see it in my image. (It was a pretty image, but I didn't have enough photons and processing ability.)

    This was also the first image for my new high rise adapter for the autoguider, which completely lived up to expectations.

    Since this was a test for both the high rise adapter and my ability to capture the North America nebula, I pushed the envelope a bit and went for 10 minute sub-exposures. The SSAG worked well at 10 minutes. (Please critique, I need it; it could have been framed better.) I wanted to try both a 15 minute and a 20 minute sub-exposure because the seeing was close to perfect and I wanted to discover where the sub-exposure length over-ran my skies. But, the wind knocked me out of the game rather early (0300).

    This is an uncropped image. I am VERY happy with my new MPCC!

    NGC 7000, magnitude: Undefined.

    Name: NGC 7000
    Camera: Nikon D700 (unmodified), prime focus
    Telescope: Astro-Tech 8” f4.0 Imaging Newtonian, SSAG w/DIY hi-rise adapter
    Mount: Atlas EQ-G
    Shutter Speed: 600 seconds
    ISO: 1600
    Temperature: 50*F, Wind: gusting to 10 mp/h, humidity: low
    Lights: 8
    Darks: 20
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  2. The Following 3 Users Say Thank You to seal killer For This Useful Post:

    jimt (11-09-2010),ozzmozizz (11-08-2010),Tombstone17 (11-07-2010)

  3. #2
    BKBrown's Avatar
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    Default

    I don't know if my opinion counts for anything DSOish but I'd be all kinds of happy to catch that image. Glad your gear is getting the job done for you

    Clear Skies, Brian
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  4. #3
    Joe Lalumia's Avatar
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    Default

    Excellent photo! Wow!
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  5. #4
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    Default

    It works - your guiding looks spot on!

    As far as critique. First of all congratulations - getting this image shows a lot done very well if not as good as can be asked for. At full res I see an uneven focus problem. Stars and spike in the upper R/H corner are pretty good (and diffraction spikes not too soft) but going in any direction away they become soft and you lose the round stars - I can see a 'doubling' of the diffraction spikes (look on brighter stars) and loss of edge by center. Stars become uneven with energy more the the R/H side. I've read these scopes can be very tricky to collimate - but it looks like maybe more an 'orthagonality issue' in keeping the CCD exactly parallel to the image focus plane. How rigid is the optic trane from the exit baffle? Did you critical focus on the center? I say an ortho problem over coma as it's uneven across the image plane.
    Last edited by klaatu2u; 11-07-2010 at 04:47 PM.

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  6. #5
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    Default

    klaatu2u--

    The double diffraction spikes are a characteristic of my images, lately. (Or, at least I have noticed them lately.) I have been thinking about them. I thought they may be caused by a breeze. I also considered the autoguider correcting too often because I use 1 second exposures, or not often enough because I use 3 second exposures.

    The optic train rigidity could be improved. I just do not know how to do it. I used a Bahtinov mask to focus on Vega. Upon reflection, I suppose that was the way-wrong thing to do. Plus, I am focusing with the mask using Live View. I should take an exposure, adjust and repeat as necessary.

    How does one address the optical train rigidity issue?

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  7. #6
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    Default

    Most scopes / focusers have their own specific issues. I've known of folks that made the entire trane threaded only to find that the focuser itself was the problem (an imaging issue - NOT talking about this scope in particular). In a Newt like this I'd try first to determine if the focuser is parallel to the light cone from the secondary, within a mm or so? Whatever error there is will be translated to the plane of focus perpindicular to it. Maybe using a tuBLUG type collimater? The specs for your scope list a precision 2-speed Crayford so though i wouldn't expect much if any check for 'play' in the locking or tensioning? Maybe other folks in the reflector forum can talk more intelligently about it - but my impression was that below f/4 mm's matter. Also am unsure about the secondary offset needed (if any) and if that can only be done imaging or if a visual accy too for it.

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  8. #7
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    Default

    Wow ,nice....
    Enjoy the Black cause they can't take it back............
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  9. #8
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    Default

    First of all congrats on those long exposures.
    For the windy conditions you ended up with a very nice image with your Newtonian.
    I'm jealous ( mine has too much focal length)
    I would try collimating the scope using a bright star star and focus in live view then compare the results with the mask in place.
    Nice work
    Ken

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  10. #9
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    Default

    Beautiful photo.
    SXINIAS

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    Default

    nice capture
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