Calculating exposure difference with ND Filter

Posted in: darrelrussell.com edit
06 Jan 2009
  • hello,
    I was wondering, how do i calculate the difference between exposures when using a Neutral Density (ND) filter?

    I.E. 2x, 4x, 8x

    Thanks


  • there are different ways of labelling ND filters. I guess the numbers you gave just mean you multiply by 2, 4, 8, ...


  • If you are using a modern camera (with a built-in meter) then once you put the filter onto the lens, the meter readings will be compensating for the filter.

    You do have to calculate it manually when you are using a hand held meter.


  • If you are using a modern camera (with a built-in meter) then once you put the filter onto the lens, the meter readings will be compensating for the filter.

    You do have to calculate it manually when you are using a hand held meter.

    Well, if you use a 64x filter in dim light (to get ultra-long exposure), then the sensitivity of the built-in meter is usually not sufficent to give really accurate values (all you see is black ;) ).


  • http://www.ephotozine.com/techniques/viewtechnique.cfm?recid=329







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