Red filter terminology

Discussion in 'Photography Equipment & Products' started by sothoth, Sep 23, 2007.

  1. sothoth

    sothoth TPF Noob!

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    Stupid question: If a red filter is referred to as "3x" does that mean you need to increase exposure 3 stops to compensate for lower light?
     
  2. sothoth

    sothoth TPF Noob!

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    Oh, and how high do they go if my assumption is correct?
     
  3. Chris of Arabia

    Chris of Arabia Herding cats since 1988... Supporting Member

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    Try this page to establish the settings needed - filter factor

    The 3x means that you need three times as much light as compensation, not 3 stops (which would be 8x as much). In your case, you need to open up by 1 2/3 stops.
     
  4. sothoth

    sothoth TPF Noob!

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    Perfect... thanks a lot.
     

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