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Thread: Purpose of ND filter

  1. #1

    Default Purpose of ND filter

    I understand that with this ND filter, we can freeze the water.

    Example with 2 stops ND filter:
    if we shoot at AV mode, F8, ISO100, we will get 1/100s (without 2 stops ND filter)
    at same setting, we will get like 1/25s (with 2 stops ND filter)

    Question:
    why do we still need to pay for ND filter as we can use TV mode and set at 1/25s.

    Anyone can answer my doubts. Thanks.

  2. #2

    Default Re: Purpose of ND filter

    The ND filter is so that ur photos don't turn out overexposed at the low shutter speed. u may not need it if the ambient light is low at the time u r taking the photo

  3. #3

    Default Re: Purpose of ND filter

    it cuts down the amount of light based on filter strength.

    if there's not much light in the scene high f-stop (smaller opening) can do the trick but be wary of diffraction limit. during daytime with harsh lighting, long exposure is possible with the use of extreme nd filters.

    short answer: it depends on the lighting situation or if the image in mind calls for its use.

  4. #4

    Default Re: Purpose of ND filter

    Quote Originally Posted by rocketatw View Post
    I understand that with this ND filter, we can freeze the water.

    Example with 2 stops ND filter:
    if we shoot at AV mode, F8, ISO100, we will get 1/100s (without 2 stops ND filter)
    at same setting, we will get like 1/25s (with 2 stops ND filter)

    Question:
    why do we still need to pay for ND filter as we can use TV mode and set at 1/25s.

    Anyone can answer my doubts. Thanks.

    some cs member here did a 45 seconds shot in day time... w/o nd filter do u think u can do that?

  5. #5

    Default Re: Purpose of ND filter

    in addition it can also be used in flash photography where bigger lens opening is needed and shutter speed can't be fast enough to compensate

  6. #6

    Default Re: Purpose of ND filter

    thanks for all the responds, learn something today.

    by the way, why some people buy 2 stops, 4 stops ... 10 stops. which is better, i know it may be for different usage depending on how much light we want to cut, but generally, most people will buy which type and why?

  7. #7

    Default Re: Purpose of ND filter

    Quote Originally Posted by sfoto100 View Post
    some cs member here did a 45 seconds shot in day time... w/o nd filter do u think u can do that?
    Perhaps achieveable on a cloudy day or in the early morning/ late evening.

    With sunlight, its almost impossible. Even at 10 secs -EV to the max and max F, it will still turnout overexposed.

  8. #8
    Member dingaroo's Avatar
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    Default Re: Purpose of ND filter

    Quote Originally Posted by rocketatw View Post
    thanks for all the responds, learn something today.

    by the way, why some people buy 2 stops, 4 stops ... 10 stops. which is better, i know it may be for different usage depending on how much light we want to cut, but generally, most people will buy which type and why?
    I've seen people hankering for ND10, some fader ND, while others, get the full range of ND2, ND4, ND6, ND8 and ND10. And some have used them stacked.

    So it all depends on usage and ambient lighting.
    A picture a day keeps the blues away!

  9. #9

    Default Re: Purpose of ND filter

    Quote Originally Posted by rocketatw View Post
    thanks for all the responds, learn something today.

    by the way, why some people buy 2 stops, 4 stops ... 10 stops. which is better, i know it may be for different usage depending on how much light we want to cut, but generally, most people will buy which type and why?
    there is no better really... when u need 10 stop, u need 10 stop.. when u need 3 stop, your very expensive 10 stop does not help... but the cheaper 3 stop helps...


    it is like what lens is good , all are good if u use them, all are bad if u don't use them...

    i have a fren who bought a uwa, and then sold it.. saying he never use it... but i think it is bcos he don't know how to appreciate it...


  10. #10

    Default Re: Purpose of ND filter

    Quote Originally Posted by rocketatw View Post
    I understand that with this ND filter, we can freeze the water.
    not freeze, smooth it out.

    for nd4/nd8, perhaps their use is clearer at twilight timing, where the typical exposure can reach to more than 10 seconds, which is insufficient to render smokey water sometimes. then extending by 2-3 stops will help make this sufficiently long.

    for nd106 (6 stops) , nd400 (9 stops) and nd110 (10 stops), purpose is clearer, because they allow long exposures in daytime. even with f/27 and iso100, you will find it hard to achieve something like this in the daytime:



    45 second exposure at noon-time.

    all nd filters have their use, and every landscape photographer wishes they had all, actually. it is not something you can replicate with photoshop.

    another purpose of light nd filters involve LARGE APERTURES in STRONG DAYLIGHT.

    for example, sometimes even at iso100, f/2.0 and the fastest shutter speed will give you an overexposed photo. adding an nd filter will help prevent getting an overexposed photo.

  11. #11
    Moderator catchlights's Avatar
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    Default Re: Purpose of ND filter

    Quote Originally Posted by rocketatw View Post
    I understand that with this ND filter, we can freeze the water.

    Example with 2 stops ND filter:
    if we shoot at AV mode, F8, ISO100, we will get 1/100s (without 2 stops ND filter)
    at same setting, we will get like 1/25s (with 2 stops ND filter)

    Question:
    why do we still need to pay for ND filter as we can use TV mode and set at 1/25s.

    Anyone can answer my doubts. Thanks.
    if you want to freeze the water, you need high shutter speed, or a freezer.

    and 1/25s is nor here or there, you can freeze the water, or make it smoother.
    Shoot to Live, Live to Shoot
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  12. #12
    Senior Member wildcat's Avatar
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    Default Re: Purpose of ND filter

    Quote Originally Posted by catchlights View Post
    if you want to freeze the water, you need high shutter speed, or a freezer.

    and 1/25s is nor here or there, you can freeze the water, or make it smoother.
    Excuse me Mr Moderator. Can I check what brand freezer is best arh? So far, I find LG is ok... but not sure about Korean quality. Will it affect the sharpness of my lens?

  13. #13
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    Default Re: Purpose of ND filter

    Just a quick question to nightmare: which filter system do you use? Tianya, Cokin, or...?

  14. #14
    Moderator catchlights's Avatar
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    Default Re: Purpose of ND filter

    Quote Originally Posted by wildcat View Post
    Excuse me Mr Moderator. Can I check what brand freezer is best arh? So far, I find LG is ok... but not sure about Korean quality. Will it affect the sharpness of my lens?
    I'm using Kadeka, made in Japen. is this the best? I'm not sure, but serve me well.


    Shoot to Live, Live to Shoot
    www.benjaminloo.com | iStock portfolio

  15. #15

    Default Re: Purpose of ND filter

    Quote Originally Posted by arctos View Post
    Just a quick question to nightmare: which filter system do you use? Tianya, Cokin, or...?
    hi

    i saw a 12 stop cokin nd.. but i am not sure if it is still in production..

    tianya only offer 3 stops nd if i am not wrong..

    for those 9 , 10 stops nm talked about, they are from B+W or Hoya...


  16. #16

    Default Re: Purpose of ND filter

    Quote Originally Posted by arctos View Post
    Just a quick question to nightmare: which filter system do you use? Tianya, Cokin, or...?
    my 10 stop nd filter is from B+W

    i only got it because it was cheaper than hoya nd400 in uk.

    other than that, i use a cokin p series filter holder, coupled with tianya filters.

    these are the cheapest of cheap that you can get for every option there.. of course if i have enough money i would consider getting better ones like those from singh-ray, but i haven't justified it to myself yet.

    what uncle catchlights said is very true, understanding what the equipment does, more important than what brand is being used. as long as not too laoya, it will do the job sufficiently well for a hobbyist.

  17. #17

    Default Re: Purpose of ND filter

    Quote Originally Posted by night86mare View Post
    all nd filters have their use, and every landscape photographer wishes they had all, actually. it is not something you can replicate with photoshop.
    is that the reason why, lenses like 14mm L which cannot put filters are not often used by landscape photographers? I wonder if Cokin holding system can be attached to it as it has a penta-hood fixed to it.

  18. #18

    Default Re: Purpose of ND filter

    Quote Originally Posted by DarkPa1adin View Post
    is that the reason why, lenses like 14mm L which cannot put filters are not often used by landscape photographers? I wonder if Cokin holding system can be attached to it as it has a penta-hood fixed to it.
    i would think so.

    anyways, i know some systems make specialised filter holders for popular lenses... like i think lee makes a filter holder for the 14-24 from nikon that doesn't accept conventional filter holders?

    for 14mm L, i don't know.

  19. #19

    Default Re: Purpose of ND filter

    Quote Originally Posted by night86mare View Post



    wow..this is really nice.. =) and thanx for all the info on filter!

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