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There does'nt appear to be a facility for holding a circular polariser on this system (i.e. the type you can rotate in the mount)
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I personally haven’t noticed this.. using the 1.8 … there is a tiny bit of discolouration using the 10 stop..This is so easily corrected using something like light room Correcting the colour temperature.
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You need a 100mm square filter holder and 77mm adaptor ring.
Format hitech is probably the more affordable. Personally I use Lee filter system.