why does this happen ?

Discussion in 'Beyond the Basics' started by fwellers, Jul 8, 2009.

  1. fwellers

    fwellers TPF Noob!

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    This is like an 80% crop of a picture I took this morning of the moon.
    I was on iso 800 f3.5 1/60 handheld.

    Using a D90 and the nifty fifty. I wonder why the red ring is around the moon. I have another image ( having a hard time getting that crop uploaded ), and it has a greenish yellow ring around the moon that's visible when fully cropped.

    I thought this was chromatic abberation, so I tried to get it out with nx2. That correction did absolutely nothing for it.
    Is this something I'm doing wrong, or is it because of the lens or something else ?

    Thanks,
    floyd




    [​IMG]
     
  2. smadab

    smadab TPF Noob!

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    I'm not sure - my guess would be the overexposed moon causing some "pixel bleed". Especially combined with the higher ISO.
     
  3. DemonAstroth

    DemonAstroth TPF Noob!

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    Chromatic aberration?
     
    Last edited: Jul 8, 2009
  4. JerryPH

    JerryPH No longer a newbie, moving up!

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    Thats what CA is supposed to look like. ;)
     
  5. Josh66

    Josh66 Been spending a lot of time on here!

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    I have never used nx2, but - I have never been able to get rid of CA with the adjustments in Lightroom.

    I don't even bother trying anymore, every time I do there is no noticeable difference. So, it doesn't surprise me that your software didn't do anything for it...


    You could try selectively desaturating just that color.
     
  6. Joves

    Joves No longer a newbie, moving up!

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    Well with the moon being that overexposed you would see some chroma. And it would change color depending on the angle it hits the galss at any one point. You are shooting at a direct reflected light source, shoot one test pic then adjust your aperture to compensate for the moon. What was the main subject anyhow because that is what is effecting how the moon turns out.
     
  7. fwellers

    fwellers TPF Noob!

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    Thanks for the replies.
    Joves, the main subject was the moon. I guess I overexposed it. I was in kind of a hurry. I thought the meter was centered, and maybe it was, but with that light source I guess it may have tricked the meter a bit.
    Live and learn.

    Thank you all.
     
  8. Joves

    Joves No longer a newbie, moving up!

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    The moon is a pain. Depending on what lens you are using. A tripod is your friend in these shots.
     
  9. fwellers

    fwellers TPF Noob!

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    Yea one of these days I'll get a tripod and start making some sharp pictures. :)
    I was thinking about it. I bet I just didn't meter correctly, since the moon was such a small part of the frame. The rest of the frame was darker so that would make the meter want to overexpose the moon.
    Yea that's it.
    the other shot didn't turn out too bad. ( for me ).:D
    [​IMG]
     
  10. musicaleCA

    musicaleCA TPF Noob!

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    O|||||||O: You really haven't been able to remove CA in LR? I've always been able to remove it. Sure, the edges are left soft but there's nothing to be done about that.
     
  11. Josh66

    Josh66 Been spending a lot of time on here!

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    The cases I'm trying it on are probably too far gone to be saved.
    If it's minor, I don't really worry about it too much.
     
  12. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Oh ya. There is quite a bit of dynamic range between bright young Tycho and the dark old Mare.

    How about an HDR of the moon, Joves. Haul out your big mirror.

    Hummmm, maybe a digital Schmidt Camera?
     

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