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  1. #21

    Join Date
    Aug 2008
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    Hi,

    I got this Zeiss 354/0 Orange 5X S 40.5mm filter, but can't find any information about it. Also filter looks like it has some coating on it.

    Does anyone know what filter factor it has and how should I adjust my exposure when using it?

    Thank you.

  2. #22
    Lee L's Avatar
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    Nov 2004
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    Quote Originally Posted by tvora View Post
    Hi,

    I got this Zeiss 354/0 Orange 5X S 40.5mm filter, but can't find any information about it. Also filter looks like it has some coating on it.

    Does anyone know what filter factor it has and how should I adjust my exposure when using it?

    Thank you.
    The 5X should be the filter factor. Multiply the exposure by a factor of 5. That's 2.3 stops. To get stops from a filter factor, usually shown as 1.1X, 1.5X, 2X, 4X, 8X, 16X, i.e. a number followed by 'X' marked on the filter bezel use:

    stops = log(filter factor)/log(2)

    both logs should be in the same base

    Lee

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