Rollei Orange filter compensation

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JPD

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It's confusing. I spent a lot of time trying to understand these numbers decades ago. I usually use the f-stops that mnemosyne recommended:

yellow +1 stop
orange + 2 stops
red + 3 stops

I agree. The "filter factor" may be mathematically correct, but not intuitive.


1.5 = 2/3 stop. 🤨
3 = 1 2/3 stops. 🤨

Stops are easier to remember, and one third of a stop doesn't make much difference for black and white for most uses, and one film can be a little more or less sensitive for different wavelengths of light than another.
 

ic-racer

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It is all trial-and-error. The whole idea of a filter is to distort the film's sensitivity spectrum. Already, without the filter, most light meters are only a close approximation of film's sensitivity spectrum.
 
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