Filters?!

Discussion in 'Beyond the Basics' started by SCHNOOBS, Jan 30, 2008.

  1. SCHNOOBS

    SCHNOOBS TPF Noob!

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    Neutral density filters? what is the most cmmon used?
    .3
    .6
    .9
     
  2. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    They are most commonly used when you want to get a longer shutter speed than the light would allow.

    For example, if you want to use a long shutter speed to blur running water...but the bright light would mean that anything over 1 second (with smallest aperture) would be over exposed. The solution is to add a neutral density filter, which doesn't affect anything else, it just block some of the light so that you need to use a longer shutter speed.
     
  3. SCHNOOBS

    SCHNOOBS TPF Noob!

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    I am sorry I worded my question wrong.
    out of those nd filters, which is used the most? I would like to purchase the most common either .6 or .9
    I hope that clarified things a little\
     
  4. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I'm not sure there is a 'most common'
     
  5. SCHNOOBS

    SCHNOOBS TPF Noob!

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    ok cool thanks, i just read that it is best to have an nd filter that does no less than 2 stops and no more then 4 stops, otherwise "their not going to do much"

    Thanks again!
     
  6. JerryPH

    JerryPH No longer a newbie, moving up!

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    For digital or film? In the digital world its near useless. You lower ISO, raise aperture and even on a well lit day you can severely underexpose.
     
  7. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    I'd prefer to use an ND filter...rather than to severely underexpose.

    But for that amount of times that I actually used an ND filter...it may not be worth it it buy one (or two).
     
  8. sabbath999

    sabbath999 No longer a newbie, moving up!

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    I have one, and it is a 4 stop filter.

    Handy for waterfalls, but that's all I use it for.
     
  9. Big Mike

    Big Mike I am Big, I am Mike Staff Member Supporting Member

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    For this shot, I believe that I used two ND 2 filters and a circular polarizing filter. It vignetted severely (because of the stacked filters) so I had to crop that out. I think the exposure was 20 or 30 seconds.

    [​IMG]
     
  10. Alex_B

    Alex_B No longer a newbie, moving up!

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    totally disagree ... NDs are very useful.

    What you say can be done with film cameras as well, so it is not even digital-specific.

    aperture is something I define in order to achieve a certain DOF ,and lowering ISO has its limits as well as shortening exposures.

    - NDs are used to have wide apertures in very bright light (and get correctly exposed images, no one wants underexposure ;))

    - NDs are used to have very long exposures in very bright lights (see the waterfall example)

    - NDs are used to get a correct exposure of extremely bright light sources such as in welding, certain melts, and so on.


    There is no most common one. It always depends on what you shoot. You should never buy equipment by the needs of others, but by your own needs.

    If you are not sure what your needs are, then you apparently have no need for NDs yet ;)
     
  11. Milhouse

    Milhouse TPF Noob!

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    If you have limited finances for your gear like most of us, I'm not sure if a 2 stop ND is worth it. If your objective is to reduce light by 2 stops, couldn't you do that with a CPL. I think they reduce light by 1-2 stops. Use a CPL when you would need a 2 stop difference, and get a 4 stop ND. You will probably find the CPL more useful in your bag than the ND.

    You have to be aware that when the CPL you will also be reducing reflections/glare, so if that is what you were trying to capture then this is not a solution.

    I also read somewhere that if you stack 2 CPL that it would act as a ND with infinite stops (as you rotate each one). Not sure what the quality would be like but sounds cool to try.
     
  12. Alpha

    Alpha Troll Extraordinaire

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    Today's digital cameras are losing stops like they're going out of style with every new release. This isn't always an option.

    Also, aperture adjustments should be used for aesthetic purposes, or for hitting your lens' sweet spot. You don't want to shoot at an unintended aperture if you don't have to.
     

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