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I just bought a Hoya yellow 2K filter. It doesn't say anywhere on the box what the filter factor is, and I've not been able to find info online about it. So I took it outside and metered a shadow area with and without the filter over the spot meter. The meter reading was 8 without the filter and 7.6 with the filter. So, what is my filter factor? I am thinking...1.3?
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