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Thread: ND106 filter question

  1. #1

    Default ND106 filter question

    i know this filter will helps to take smooth water surface, but want to know how it benefits us? Can i say we can take at a faster shutter speed and yet still achieve the desire exposure for smooth water surface.

    take for example without filter, at f5.6 pointing at a clear water surface, i half press the exposure timing shows 1/4s, so now if i put on the ND106 filter, at the same f5.6, what will the exposure timing be? can i say ND106 is 6 stops, so the exposure timing will be 1/256s base on the below 6 stops calculation.

    1/4s, 1/8s, 1/16s, 1/32s, 1/64s, 1/128s, 1/256s

    i am looking to buy a ND106, or ND110 filter, but just want to clear some doubts

  2. #2

    Default Re: ND106 filter question

    I think you got it the wrong way. A 6-stop ND filter reduce the amount of light that passes through by 2^6 = 64 times, so to get the same amount of light, you need to open your shutter for 64 times longer. A 1/4sec exposure becomes 16sec to get the same exposure with the filter, all other settings being equal.

  3. #3

    Default Re: ND106 filter question

    Quote Originally Posted by CamInit View Post
    I think you got it the wrong way. A 6-stop ND filter reduce the amount of light that passes through by 2^6 = 64 times, so to get the same amount of light, you need to open your shutter for 64 times longer. A 1/4sec exposure becomes 16sec to get the same exposure with the filter, all other settings being equal.
    thanks for the clarification, so now if my exposure is 1/4s, with filter on it will be 16secs right? i always thought we can take smooth water surface with nd filter at a shorter exposure, hence no need tripod. i am wrong.

    so what do we achive here with all setting the same, except with nd filter. the water surface will be smoother? i still dont see the reason to get the nd filter since i can set to TV mode and set to 16sec exposure, i believe i will still get smooth water surface. correct me if i am wrong, just want to know the adavantages of the filter.
    Last edited by rocketatw; 3rd May 2010 at 12:01 PM.

  4. #4

    Default Re: ND106 filter question

    Quote Originally Posted by rocketatw View Post
    thanks for the clarification, so now if my exposure is 1/4s, with filter on it will be 16secs right? i always thought we can take smooth water surface with nd filter at a shorter exposure, hence no need tripod. i am wrong.
    Yes. To get smooth water surface requires a longer exposure which will accumulate the spread of water disturbances across time. A stable support is a must.

  5. #5

    Default Re: ND106 filter question

    Quote Originally Posted by CamInit View Post
    Yes. To get smooth water surface requires a longer exposure which will accumulate the spread of water disturbances across time. A stable support is a must.
    but i can also set to TV mode and set to 16sec exposure? i believe i will still get the same result right, since both ways still require a tripod. with both method at 16secs, which will get a better picture.
    Last edited by rocketatw; 3rd May 2010 at 12:06 PM.

  6. #6
    Moderator catchlights's Avatar
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    Default Re: ND106 filter question

    Quote Originally Posted by rocketatw View Post
    i know this filter will helps to take smooth water surface, but want to know how it benefits us? Can i say we can take at a faster shutter speed and yet still achieve the desire exposure for smooth water surface.

    take for example without filter, at f5.6 pointing at a clear water surface, i half press the exposure timing shows 1/4s, so now if i put on the ND106 filter, at the same f5.6, what will the exposure timing be? can i say ND106 is 6 stops, so the exposure timing will be 1/256s base on the below 6 stops calculation.

    1/4s, 1/8s, 1/16s, 1/32s, 1/64s, 1/128s, 1/256s

    i am looking to buy a ND106, or ND110 filter, but just want to clear some doubts
    you counter the wrong way..

    1/256s is shorter, faster shutter speed than 1/4s
    Shoot to Live, Live to Shoot
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  7. #7

    Default Re: ND106 filter question

    Quote Originally Posted by rocketatw View Post
    so what do we achive here with all setting the same, except with nd filter. the water surface will be smoother? i still dont see the reason to get the nd filter since i can set to TV mode and set to 16sec exposure, i believe i will still get smooth water surface. correct me if i am wrong, just want to know the adavantages of the filter.
    You use ND filter when you cannot increase the shutter opening duration without getting over-exposure. Let's say your camera recommends an exposure of f/5.6, ISO100 and 0.25sec. To increase exposure timing, you set to an equivalent exposure of f/22, ISO100 and 4sec. You can't get decrease your aperture size any more. ISO is at the minimum. Going beyond 4sec will over-expose your picture. Your waves are still not smooth enough.

    What to do? Adding a 2-stop ND filter will drag your exposure from 4 to 16sec. A 3-stop will further double to 32sec. This is one way. Then again, for some reason, if you prefer the look of f/5.6 rather than f/22, then you still need a 6-stop ND filter for a 16sec exposure. This is another way.

  8. #8

    Default Re: ND106 filter question

    Quote Originally Posted by CamInit View Post
    You use ND filter when you cannot increase the shutter opening duration without getting over-exposure. Let's say your camera recommends an exposure of f/5.6, ISO100 and 0.25sec. To increase exposure timing, you set to an equivalent exposure of f/22, ISO100 and 4sec. You can't get decrease your aperture size any more. ISO is at the minimum. Going beyond 4sec will over-expose your picture. Your waves are still not smooth enough.

    What to do? Adding a 2-stop ND filter will drag your exposure from 4 to 16sec. A 3-stop will further double to 32sec. This is one way. Then again, for some reason, if you prefer the look of f/5.6 rather than f/22, then you still need a 6-stop ND filter for a 16sec exposure. This is another way.
    i think i understand now, thanks for the clarification.

  9. #9
    Moderator daredevil123's Avatar
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    Default Re: ND106 filter question

    Quote Originally Posted by rocketatw View Post
    but i can also set to TV mode and set to 16sec exposure? i believe i will still get the same result right, since both ways still require a tripod. with both method at 16secs, which will get a better picture.
    Yes, but you will be forcing the aperture to be too small. When aperture is too small, you actually lose sharpness due to small aperture diffraction. On a D90 it is advised not to go smaller than F/16. Not sure what camera you are using though.

  10. #10
    Moderator Octarine's Avatar
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    Default Re: ND106 filter question

    Quote Originally Posted by rocketatw View Post
    but i can also set to TV mode and set to 16sec exposure? i believe i will still get the same result right, since both ways still require a tripod. with both method at 16secs, which will get a better picture.
    No. Tv is a half-automatic mode and will set the aperture to something that might not be suitable. Your initial example was good: fix the aperture in Av or M to achieve the desired Depth of Field. Then add the filter and set the shutter speed according metering (in M) or let the cam set (Av). Tripod is a must.
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