Archived posting to the Leica Users Group, 2001/09/18

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Subject: Re: [Leica] Filter Factors
From: Johnny Deadman <>
Date: Tue, 18 Sep 2001 21:34:59 -0400

on 9/18/01 7:43 PM, John Collier at wrote:

> The one thing that has not yet been mentioned is that a filter is supposed
> to change things. If you use a blue filter and point it at a blue sky, it
> will have little or no effect if you use your camera meter. Like anything
> else you have to think about what your intended purpose is when using a
> filter and meter accordingly.

correct! Ansel Adams points out that using a red filter in the desert may
give you overexposure if you abide by the standard filter factor, since the
desert is weighted towards red hues.

the semi-un-intuitive corollary of this is that you should use a filter of
the same hue as the subject whose contrast you are trying to increase. EG
use a red filter for a red rock, a green filter for foliage etc.
- -- 
John Brownlow

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