Over the years I have collected a number of polarizers, but you really only need one, big enough for your biggest diameter lens (in my case, 77mm) and a step-up ring which will allow you to put bigger filters on smaller lenses.
Over the years I have collected a number of polarizers, but you really only need one, big enough for your biggest diameter lens (in my case, 77mm) and a step-up ring which will allow you to put bigger filters on smaller lenses.