Yes. It's a 24mm lens with an 82mm filter thread - 4x6" filters in a holder with an 82mm adapter will work. Personally, I use round/threaded filters with mine - a B+W Käsemann CPL and a Schneider Optics (parent company of B+W) 10-stop ND. I go with rectangular filters for grad ND.
Thank you neuroanatomist for quick reply... any of those filters available for sale through some retailer in the EU? Oh... and leave the glia and the Purkinje in peace! ;D
