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Thread: Why Are The Lights Doing This ?

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    Smile Why Are The Lights Doing This ?

    Any idea why the lights on this jetty appear as they do.
    Have taken similar before without this.
    Is it wind, sea mist etc. ?
    I think the EXIF should show but,
    6.40am
    D3100
    18-55 lens
    5/2 sec
    f9
    38mm
    iso 800 ( which was changed back to 100 once I realised )
    Cheers
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    Last edited by sanger; 13-03-2017 at 9:07am.

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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Nice image, Sanger. Pity it is an annoyance.
    Notice that the streaking doesn't occur in the reflected lights
    on the water.

    I get streaks like this with my phone when there is a bright central-ish
    source (recently, on a downlight in the ceiling). I can only put it down to
    light bouncing off some internal parts of the camera when the aperture is
    at a pretty wide setting. However I'm still about it.

    A search on Google has lots of the same Qs asked and as many arm-waving
    replies. I'd guess: try the same thing with your more controllable camera,
    setting the aperture progressively from wide to narrow for each shot. You might
    be instrumental in providing a definite reply.
    CC, Image editing OK.

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    Administrator ricktas's Avatar
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    what is 5/2 of a second? Did you mean 2.5 second exposure?

    Do you have any sort of filter on the lens used?
    "It is one thing to make a picture of what a person looks like, it is another thing to make a portrait of who they are" - Paul Caponigro

    Constructive Critique of my photographs is always appreciated
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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Hmm! Having had another - better - look at the exif, I see it was taken at f/9.
    That almost suggests an answer to me:
    It is caused by diffraction of the bright lights through the very small aperture that f/9
    would give on a f=30mm lens - viz, about 3mm. Now, why they are aligned like that is
    another thing. I bet, though, that the angle of the camera to the lights would have had
    some effect, and if you shifted the image in the camera the orientation of the streaks
    would change.

    - - - Updated - - -

    PS: the foregoing is NOT definitive.

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    Quote Originally Posted by ricktas View Post
    what is 5/2 of a second? Did you mean 2.5 second exposure?

    Do you have any sort of filter on the lens used?
    Good pick up...it was 2.5...and no filter.

    - - - Updated - - -

    Quote Originally Posted by ameerat42 View Post
    Nice image, Sanger. Pity it is an annoyance.
    Notice that the streaking doesn't occur in the reflected lights
    on the water.

    I get streaks like this with my phone when there is a bright central-ish
    source (recently, on a downlight in the ceiling). I can only put it down to
    light bouncing off some internal parts of the camera when the aperture is
    at a pretty wide setting. However I'm still about it.

    A search on Google has lots of the same Qs asked and as many arm-waving
    replies. I'd guess: try the same thing with your more controllable camera,
    setting the aperture progressively from wide to narrow for each shot. You might
    be instrumental in providing a definite reply.
    Hmmm...There was a big bright light at the start of the jetty behind me.
    Must go back and try to solve.

    - - - Updated - - -

    Quote Originally Posted by ameerat42 View Post
    Hmm! Having had another - better - look at the exif, I see it was taken at f/9.
    That almost suggests an answer to me:
    It is caused by diffraction of the bright lights through the very small aperture that f/9
    would give on a f=30mm lens - viz, about 3mm. Now, why they are aligned like that is
    another thing. I bet, though, that the angle of the camera to the lights would have had
    some effect, and if you shifted the image in the camera the orientation of the streaks
    would change.

    - - - Updated - - -

    PS: the foregoing is NOT definitive.
    Maybe because I was down low looking up.
    I shall practice

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    Administrator ricktas's Avatar
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    You mentioned that this was at ISO 800, when you changed it back down, did this anomaly still occur?

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    Quote Originally Posted by ricktas View Post
    You mentioned that this was at ISO 800, when you changed it back down, did this anomaly still occur?
    Yep, same at f11, iso 100
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    Arch-Σigmoid Ausphotography Regular ameerat42's Avatar
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    Then I wonder how they'll go with the aperture more open?

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    Quote Originally Posted by ameerat42 View Post
    Then I wonder how they'll go with the aperture more open?
    20 mins later
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    Administrator ricktas's Avatar
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    it looks quite dull, was there a seamist or slight fog about? It could be the light refracting of mist that only shows up more as you extend the time the shutter is open

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    Quote Originally Posted by ricktas View Post
    it looks quite dull, was there a seamist or slight fog about? It could be the light refracting of mist that only shows up more as you extend the time the shutter is open
    Yep I wondered about sea mist which I noted in the first post.
    It wasn't windy but I was close to the water with the wash coming close to me....it got me and the tripod a couple of times.

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    Dirty lens with a smudge mark being more sensitive to the brighter lights than the reflected ones in the water?
    Last edited by wmphoto; 14-03-2017 at 9:00pm.

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    Quote Originally Posted by wmphoto View Post
    Dirty lens with a smudge mark being more sensitive to the brighter lights than the reflected ones in the water?

    I reckon that's it or lens damage...went to the jetty tonight and same had the same issue but not on another lens or my phone.

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