long exposure question

Discussion in 'Digital Photography' started by rweakins, Apr 7, 2009.

  1. rweakins macrumors 6502


    May 3, 2007
    is there a simple way to calculate the shutter speed needed for a long exposure know what f number and all you want to use and accounting for any filters that may be used
  2. PCMacUser macrumors 68000


    Jan 13, 2005
    You need a TTL light meter.
  3. Rockies Photo macrumors newbie

    Jan 8, 2008
    What are you shooting?

    Example: If shooting stars/ or something of equal nature, then, put the camera in Bulb mode, get a cable release, and lock the shutter open. Lowest ISO possible i.e. 100, F/11 to F/16, then start doing variable exposures. By doing that, you will develop your own baseline for exposure values, for your needs :)

    Hope this helps.
  4. patricksan macrumors member

    Jul 26, 2008
    Londerzeel, Belgium

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