Filter system?

[Paul Eriksson]

I've been thinking about getting a filter system lately, mainly for grad 
nd's but maybe other filters as well.  One obvious problem is vinegretting 
with my FA* 24mm when I also use my Heliopan polarizer.
What filter systems do you use?
Also is there a vinegretting problem with the 24mm when using two screw in 
filters?
All help would be much appreciated
Paul

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