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Thread: what could have caused this? long exposure issue...

  1. #1

    Default what could have caused this? long exposure issue...



    firstly i apologise for the slip shod pp, as i was trying to get this photo out asap.

    not sure if you guys can see there is this streak of darker blue running down from the sky, somewhere about top left portion.

    then there is this blue cast at the right side of the sea, near the horizon.

    few of my other photos also did exhibit such problem.

    my setup as below:

    -Canon 7D + 10-22
    -3rd party square filter holder from OP(Lee Foundation kit replica)
    -Lee Big Stopper
    -Hitech 0.6 GND
    -10mm/ISO 100/f9.0/30s

    please do help me in identifying the problem and avoid OT-ing in this thread. Thanks.
    Last edited by tecnica; 29th April 2012 at 12:44 PM.

  2. #2
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    Default Re: what could have caused this? long exposure issue...

    My guess: Uneven surface of GND or the Big Stopper? Uneven surface may cause uneven distribution of light to the particular area. If according to my guess... Try to shoot with only one of the item, as in shoot with only the Big Stopper to see if problem exists? If it doesn't I think it's the GND filter that is causing the problem.
    Too many great equipments but too little quality photos. [My Flickr] | [My Blog]

  3. #3

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by SkyStrike View Post
    My guess: Uneven surface of GND or the Big Stopper? Uneven surface may cause uneven distribution of light to the particular area. If according to my guess... Try to shoot with only one of the item, as in shoot with only the Big Stopper to see if problem exists? If it doesn't I think it's the GND filter that is causing the problem.
    i had the hitechs for quite some time, no issues with it at all. yesterday got the big stopper and had this colour cast prob. hmmm.

    this is not light leak right?

  4. #4
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    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by tecnica View Post
    i had the hitechs for quite some time, no issues with it at all. yesterday got the big stopper and had this colour cast prob. hmmm.

    this is not light leak right?
    I doubt it's light leak....as those light leak cases I saw before on other websites are loss of color instead of a more saturated color. Unless the light leak is so jialat that only that part never leak

    OTOH, some flaws of the filters are only seen in long exposure. As sometime ago, during a sharing session, I was told that for IR, the uneven surface of filter may cause the picture to have different colors/exposure on some part of the picture. So I though this might be the case too..

    You may want to try using the Big Stopper only and see if the problem persist.
    Too many great equipments but too little quality photos. [My Flickr] | [My Blog]

  5. #5

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    Sorry to sound obvious but is there a smudge at that particular area on the filter?

  6. #6

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by SkyStrike View Post
    I doubt it's light leak....as those light leak cases I saw before on other websites are loss of color instead of a more saturated color. Unless the light leak is so jialat that only that part never leak

    OTOH, some flaws of the filters are only seen in long exposure. As sometime ago, during a sharing session, I was told that for IR, the uneven surface of filter may cause the picture to have different colors/exposure on some part of the picture. So I though this might be the case too..

    You may want to try using the Big Stopper only and see if the problem persist.
    good to know that it is not light leak as i thought it maybe due to the 3rd party holder.

    will try it out again next week. if it persist, i wonder is it possible to RMA it?

    Quote Originally Posted by spree86 View Post
    Sorry to sound obvious but is there a smudge at that particular area on the filter?
    no, as i cleaned my filters before using them.

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    Default

    Quote Originally Posted by tecnica

    good to know that it is not light leak as i thought it maybe due to the 3rd party holder.

    will try it out again next week. if it persist, i wonder is it possible to RMA.
    not sure if you can rma filter... I also have yet to try out my b+w 10 stop..
    Too many great equipments but too little quality photos. [My Flickr] | [My Blog]

  8. #8

    Default Re: what could have caused this? long exposure issue...

    without photo, I will make a few guess here. if it is light leaking, probably sunlight is hitting the exposed part of the filter.
    Coolthought - 冷静思考 - クールだ http://xaa.xanga.com/0aba0666d143253.../t35917343.gif

  9. #9

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by coolthought View Post
    without photo, I will make a few guess here. if it is light leaking, probably sunlight is hitting the exposed part of the filter.
    i posted the photo already~?

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    Default Re: what could have caused this? long exposure issue...

    Do you cover your view finder when shooting in bright sunlight? It looks like light leak through the viewfinder.

  11. #11

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by linse View Post
    Do you cover your view finder when shooting in bright sunlight? It looks like light leak through the viewfinder.
    doubt it is light leak. judging by the shadow on the ground, the sun is on the side.

    btw light leaks doesn't happen that easily in normal shooting situations and modern cameras.

  12. #12

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by linse View Post
    Do you cover your view finder when shooting in bright sunlight? It looks like light leak through the viewfinder.

    yes, i covered the VF when taking the photos.

    used LV almost exclusively, to compose my photos.

  13. #13
    Deregistered allenleonhart's Avatar
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    Default Re: what could have caused this? long exposure issue...

    why i like cannot see anything wrong? o.o

  14. #14

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by allenleonhart View Post
    why i like cannot see anything wrong? o.o
    The flaws are not that obvious, but if you look closely, they are there.

  15. #15

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by allenleonhart View Post
    why i like cannot see anything wrong? o.o
    perhaps you need to change your specs bro.

    @TS, try shooting with just the Big Stopper to see if it's the same.

    but to me, perhaps it's just reflections?

  16. #16

    Default Re: what could have caused this? long exposure issue...

    Quote Originally Posted by kei1309 View Post
    perhaps you need to change your specs bro.

    @TS, try shooting with just the Big Stopper to see if it's the same.

    but to me, perhaps it's just reflections?
    will do, prolly next weekend.

    i think i post 1 or 2 more pics tmr.

  17. #17
    Member Mythmaker's Avatar
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    Default Re: what could have caused this? long exposure issue...

    Seems like the issue lies with the big stopper...

    Try doing a long exposure on a white piece of paper to see if it's even.

  18. #18
    Senior Member edutilos-'s Avatar
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    Default Re: what could have caused this? long exposure issue...

    This doesn't look like a light leak from viewfinder.

    It may be a smudge on one of your filters. Did you clean them before using?

    If it's fine, the next question is, have you been cleaning your sensor? Is this a new issue, or have you used it previously with no such problem?

    If you look through older pictures with the same combination and the smudge is constantly there on the same spot or shifts slightly then the problem is with the filters. If not something changed. It could be cleanliness, it c ould be smudging on sensor, it could be anything. Even on lens rear element and front element. Have to check all these before we can be sure of what the problem is.
    Last edited by edutilos-; 29th April 2012 at 11:32 PM.

  19. #19
    Senior Member edutilos-'s Avatar
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    Default Re: what could have caused this? long exposure issue...

    By the way, I see your streak, but I don't see any issue with teh blue cast near the horizon. Sometimes the water bunches up because of the currents and you get such things.

  20. #20

    Default

    I don't have this problem until yesterday I used the big stopper.

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