ND Grad filters

Discussion in 'Beyond the Basics' started by Rob, Feb 24, 2006.

  1. Rob

    Rob TPF Noob!

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    I've got this idea for a shot. It's going to be taken during the day and I need a three to five second exposure. Anyone have any idea what kind of ND Grad I'd need to pull this off, given murky UK weather?

    Rob
     
  2. PlasticSpanner

    PlasticSpanner TPF Noob!

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    Each filter is 1 stop so you should be able to calculate it from there!

    So it's 1/60 @ F11

    So you'll need up to 8 ND to get 4 secs @ F11 i.e 2 X 4 ND
     
  3. PlasticSpanner

    PlasticSpanner TPF Noob!

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    It would probably be more economical to buy the at 4, 3, 2 and 1 & use all of them.

    That way you'll have a good selection to use in the future! :thumbup:
     
  4. PlasticSpanner

    PlasticSpanner TPF Noob!

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    Back again! :lol:

    BTW do you mean to use ND Gradient filters or just ND filters?
     
  5. Rob

    Rob TPF Noob!

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    Just flat ones, maybe one grad for the sky balance.

    Rob
     
  6. MyCameraEye

    MyCameraEye TPF Noob!

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    Not sure what your idea is but I use a ND 8X on a Sunny day along with a polarizer to make waterfalls look like milky. Not sure if this runs along the same line with your idea but this might help.
     
  7. duelinthedeep

    duelinthedeep TPF Noob!

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    what does an ND filter do anyway?
    whats the diff between ND and ND gradient filters?
     
  8. PlasticSpanner

    PlasticSpanner TPF Noob!

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    An ND Filter is a Neutral Density filter that simply reduces the light entering the lens/camera without adding or removing any colour.

    A normal ND filter is the same density all the way across it and an ND Gradient filter will increase in density from one side to the other e.g to darken a sky without darkening the landscape.

    Gradient filters can also be coloured to turn overcast skies blue or pale sunsets red for example.
     
  9. duelinthedeep

    duelinthedeep TPF Noob!

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    ohhhh..thats great information thanks!
     
  10. Insomniac

    Insomniac TPF Noob!

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    Rob, if you're looking to balance the exposure of the sky to a darker foreground use a graduated ND filter, you can darken the sky bringing it closer to the foreground exposure.

    For anyone that is unfamiliar, this is an example of a ND filter produced shot. I believe this was mid morning with a 4x ND filter.

    [​IMG]
     
  11. JonathanM

    JonathanM TPF Noob!

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    Can using a polariser prodeuce a similar eduction in light, but to a lesser extent? Maybe only 1 stop? Or does a polariser alter the colour entering the camera?
     
  12. PlasticSpanner

    PlasticSpanner TPF Noob!

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    A polarizer will alter the colours through the lens and will only reduce the exposure by 1/2 - 1 stop.
     

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