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Message: <blockquote data-quote="STM" data-source="post: 116012" data-attributes="member: 12827">I am assuming you are talking primarily about black and white film as that is where the majority of filters are used. It is usually best to meter with the filter already in place. Filters vary widely when it comes to their exposure factors, from 0 stops with a K2 (yellow) filter to 3 stops with a 25A (red) filter. In the case of a rotating polarizing filter, depending on the angle the sun is coming hitting the subject, its eposure factor can vary considerably. There is also going to be some variability between manufacturers so it is best to meter with the actual filter in place.</blockquote>