I have a set of neutral density filters that are rated as .3, .6, and .9 stops. Are they actually multiples of 0.3, or are they really multiples of 1/3? For example 1/3, 2/3, and 1 stop? If I stack the .3, .6, and the .9 is that 1.8 stops or 2 stops?
If it really is multiples of .3, what's the reasoning for that?
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