Please advice the question. I have Cokin red (003) filter. According to producer specification the factor is 3 1/3 EV. But if I use spotmeter (Sekonic L508) the factor of the filter is float value depending on certain scene (I meter without the filter and through the filter and get the EV difference). And this value is about 2.1-3 EV (in most cases about 2.3 EV). So the question is – that figure should I trust – official documentation or metering through filter? Firstly, I thought that the metering through filter is right way but someone told me spotmeters have different spectral sensitivity and the density of the filter measured by densitometer and therefore I should use the documentation value. Unfortunately at the moment I can not make a test so please pass your opinion.
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