Welcome to InspirePilots.com

Join the leading DJI Inspire community for free!

Bright halo / spot in pictures and videos

Discussion in 'Inspire 1 Help' started by Thierry, Apr 21, 2015.

  1. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    Hi there !
    I would like to know if some one have already met that kind of issues. I have a bright halo in some pictures and videos. It seems that it's related to where the sun is and the cam position. It's really annoying in videos. I have tested with both filters and can see the same problem. Should I try without them ?
    What's odd is that it also seem to match the Inspire 1 shadow position on the ground. When it's close to the ground you can easily see it. I wonder if it's something reflecting from the quad structure laterally in the lens or ... ?
    Any idea ? Thanks for your feedback :)
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG]
    [​IMG] [​IMG]
     
  2. jon b

    Joined:
    Jan 8, 2015
    Messages:
    394
    Likes Received:
    129
    Location:
    Chicago
    I've seen this as well. Assumed it's lens flare happening where I was shooting either midday or slightly toward the sun.

    Looks like in your shots, you are side-on to the sun.

    You can see that in this video at 40 second mark

     
  3. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    Thanks for you feeback Jon, I can see clearly the exact same issue in the grass at 40 sec. Happy to read that am not the only one ;-) It's weird and can't be a kind of lens flare in my opinion. It should be visible when you face the source of light... Am really wondering if it's come from a reflection on the body/landing gears coming right on the side of the lense.
    It's a real problem lowering shot quality....Will continue my investigations, thanks for other suggestions !
    PS nice video !
     
  4. The Editor

    The Editor Moderator
    Staff Member

    Joined:
    Aug 7, 2013
    Messages:
    6,705
    Likes Received:
    3,863
    It's not unique to the Inspire - I have seen the same phenomenon on GoPro's slung from quads and hexacopters.

    It is THE sun causing it and it appears when the sun is behind the craft.

    I'm not actually sure how or why though!?!?! :confused:
     
  5. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    Hey,thanks for the feedback,good to know!
    Am really curious to learn how it's happening... Because... if the only solution to avoid the effect is flying in a cloudy weather,my shot will be less sexy ;-/ it's sooooo visible when you have a grass field or continuons color on the ground. Green seems to be the color that 'highlight' it the most by the way.
     
  6. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    #6 Thierry, Apr 21, 2015
    Last edited: Apr 21, 2015
  7. Daniel Mascheck

    Joined:
    Feb 20, 2015
    Messages:
    203
    Likes Received:
    35
    Just curious, but what kind of crops are in the photos? I plan on using the Inspire flying over fields in the Gulf Coast of Texas. Are these in Europe. Notice the controlled alley ways.
     
  8. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    Yes, that's in Europe, Switzerland. It's a corn field, the crops will be less visible in some weeks when the corn is higher ;-)
     
  9. The Editor

    The Editor Moderator
    Staff Member

    Joined:
    Aug 7, 2013
    Messages:
    6,705
    Likes Received:
    3,863
    Opposition effect - So now I know! Most noticeable on uniform fields of crops no less!

    Makes sense, thank you :)
     
    DamesNY likes this.
  10. Daniel Mascheck

    Joined:
    Feb 20, 2015
    Messages:
    203
    Likes Received:
    35
    Curious to know your row spacing on the corn? Seems it is very narrow row. I plan on surveying corn with Central pivot irrigation in our area of the Gulf Coast of Texas,

    Last time I was in Switzerland, I never ran across much corn. What area of Switzerland?
     
  11. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    Sorry am not a corn field specialist but I know that everything is smaller in Switzerland ;-)
    That's exactly there, in the french part of Switzerland, near Lausanne. https://www.google.ch/maps/place/46...385,1008m/data=!3m2!1e3!4b1!4m2!3m1!1s0x0:0x0
    You'll see that there is a lot of culture in this area.
     
  12. jon b

    Joined:
    Jan 8, 2015
    Messages:
    394
    Likes Received:
    129
    Location:
    Chicago
    BTW, I've seen sun shields made to fit right on the threaded end of the inspire camera for sale that supposedly eliminate this. Basically this is a kind of lens flare, the lens is getting hit by the sunlight. Even a glancing blow from an acute angle can cause this. Inspire, go pro, all the action cameras are wide angle and susceptible. Lots to keep in mind when you set-up a shot.
     
  13. DaBone

    Joined:
    Jan 11, 2015
    Messages:
    406
    Likes Received:
    96
    Location:
    Sweden
    How can you get a lensflare, when the sun is behind the camera ..? o_O
     
  14. m00se

    Joined:
    Mar 30, 2015
    Messages:
    670
    Likes Received:
    137
    this is very interesting, it may well explain some things I have seen in the past when doing photogrammetry at the time of day when the sun is at its Zenith. This is an annoying thing to say the least, as for many jobs you want to fly when the sun is at its zenith to avoid shadows in the job.

    I wonder if there is a fix we can invent for this?
     
  15. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
    Am not sure that a sun shield would help in that case...(but am interested to get a link on the product). It has nothing to do with a lens flare obviously. The only thing I can imagine to counter the opposition effect is...post production. A pain for videos... other ideas ?
     
  16. DaBone

    Joined:
    Jan 11, 2015
    Messages:
    406
    Likes Received:
    96
    Location:
    Sweden
  17. Thierry

    Joined:
    Apr 21, 2015
    Messages:
    12
    Likes Received:
    0
  18. jon b

    Joined:
    Jan 8, 2015
    Messages:
    394
    Likes Received:
    129
    Location:
    Chicago
    You can't, but that's not the case in the shots at the top of the thread or in my experience. Course with the sun directly behind you, you have to avoid placing a shadow of your craft in the shot.

    It's got to be light bouncing around the lens elements from somewhere...

    I'm going to do a little flying mid afternoon and put the camera at a few angles to the sun to see what happens. Get back to this thread soon
     
    lrwskyfilms likes this.
  19. The Editor

    The Editor Moderator
    Staff Member

    Joined:
    Aug 7, 2013
    Messages:
    6,705
    Likes Received:
    3,863
    Errrr.....guys, Don't waste your time trying to eliminate it (other than in post) because you won't.
    It is not something that is unique to cameras, our eyes see it as well as it's just physics. It happens all the time but is only noticeable in certain situations - mostly on uniform crops due to the texture of the subject and acute angle of the crops causing reflected light to go off axis from our view point.
    As light travels in straight lines (for the purposes of this phenomonen anyway) what we see in the world is made up of reflected light. (We Don't actually see any objects at all, only the light reflected from them)
    In this scenario, when we view crops from above with the sun directly behind and at the same angle most of the light is reflected at angles off the crops which means what you see is very slightly darker. The bright spot is the light reflected in exactly the same plane as your viewpoint and angle and therefore very little of the light is lost in shadow/reflection. This then appears as a slightly brighter area from our viewpoint.
     
    DamesNY and SanCap like this.
  20. lrwskyfilms

    Joined:
    Nov 17, 2014
    Messages:
    668
    Likes Received:
    208
    o_O What he said. :D
     
    DamesNY likes this.