1. Reminder: Please use our affiliate links for holiday shopping!

Now what in heck is this? Strange artifact in daytme moon shot. FZ200

Discussion in 'Superzoom Salon' started by Jock Elliott, Oct 5, 2015.

  1. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    Here's the original:

    FZ200 misc 025.JPG
    Here's the same image after going through Picasa's "I'm feeling lucky" function:
    FZ200 misc 025-001.JPG
    DXO 9 and Perfect Effects produce similar results.

    I figure it is an optical artifact, but what?

    Cheers, Jock
     
    • Like Like x 1
  2. gryphon1911

    gryphon1911 SC Top Veteran

    538
    Feb 6, 2015
    Central Ohio, USA
    Andrew
    Sensor dust maybe?
     
  3. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    I have never seen sensor dust, so I don't know, but would it be circular?

    Cheers, Jock
     
  4. dalethorn

    dalethorn Guest

    That is A #1 weird. A shadow of your subject created by PP? If that's a software bug it's scary.
     
  5. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    I think I can see the merest ghost of the artifact in the original . . .

    Cheers, Jock
     
    • Like Like x 1
  6. Luke

    Luke Super Moderator

    Nov 11, 2011
    Milwaukee, WI USA
    Luke
    To test for sensor dust, shoot a blank white wall or shoot of paper with your aperture stopped down as far as it goes (f11 or f16 maybe on your Panasonic?). Any dust will be revealed. Of course, dust moves around so it may have shaken loose.
     
    • Informative Informative x 1
  7. gryphon1911

    gryphon1911 SC Top Veteran

    538
    Feb 6, 2015
    Central Ohio, USA
    Andrew
    Yes, sensor dust is circular. It generally has a darker center and lighter outside...but depending on the aperture used and the size of the dust, it could look just like you've shown here. It is especially prominent in solid colors or sky gradients. As Luke mentioned, you can determine is this is the case by photographing a blank white wall or piece of paper at a small aperture.
     
    • Informative Informative x 1
  8. dalethorn

    dalethorn Guest

    I get it now. The moon (in most of my photos anyway) needs a lot of enhancement to show off the craters etc., so the big enhancement made the spot pop out like that.
     
  9. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    Well, merde. Just did the test. Apparently it is dust on the sensor. Fortunately Al the camera guy is just a few miles away.

    It's significantly more expensive to get the sensor cleaned because you have to take the camera apart. (And here I was thinking I was ahead of the DSLR/ILC camera guys because you expose your sensors to dust when you change lenses.)

    Cheers, Jock
     
  10. Luke

    Luke Super Moderator

    Nov 11, 2011
    Milwaukee, WI USA
    Luke
    Uggggh. I feel for you, Jock. That won't be cheap. My condolences.
     
    • Appreciate Appreciate x 1
  11. dalethorn

    dalethorn Guest

    Digital cameras are electrostatic devices and are big-time magnets for dust, internally. Fortunately, most such devices are sealed just well enough to preclude problem dust getting in. In my experience, battery compartments, SD card slots, cable connection compartments - those are the most likely entrance points. I address those problems by never carrying a camera loose in a pocket - if I carry in a pocket it's with the camera in a zippered pouch that's 100 percent closed.
     
    • Agree Agree x 1
    • Informative Informative x 1
  12. bluzcity

    bluzcity SC Veteran

    313
    Jul 30, 2013
    Memphis, TN
    Brent
    FWIW the original looks much better than the feeling lucky version to me.
     
    • Like Like x 1
  13. kyteflyer

    kyteflyer ~@¿@~

    Jan 31, 2011
    Newcastle, Australia
    Sue
    Anything with a zoom is going to eventually be prone to dust intrusion. it gets sucked in by the zoom motion. So far, I've been lucky. I guess the advantage of ILC is that you *can* do a sensor clean yourself, whereas with all in ones, you can't.

    The other thing I do, also, is check the zoom barrel to see if there is much dust on it and if there is, I give it a quick wipedown with an antistatic cloth, before turning it off. This is only when I put it away. if its in and out frequently whilst in use... definite risk.
     
    • Informative Informative x 1