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| p.1 #6 · Variable Neutral Density Filters-- polarizer needed? |
This will work with two linear polarizers as well, but you would generally want to use a circular polarizer in the "innermost" position, for the same reasons as when using a polarizer alone. I experimented with this, using a standard threaded CP and a holder-mounted Lee 4 x 4 linear polarizer. The idea was to adjust the innermost polarizer for the degree and location of the polarization effect, and then adjust the outer polarizer (without moving the inner) for the degree of neutral density. This worked, but as others have reported, I got a blueish color cast and discernible pattern of uneven darkening (X-shaped) when the adjustment approached 5 stops. I returned the Lee linear polarizer and now just use standard ND filters, when needed, in conjunction with the threaded polarizer.