in my opinion, filters are one of the feww weak points of the hasselblad system. they are all terribly expensive and the Hassy filter bayonet do not always stay put very securely. Iended up with a set of Tiffen filters in Hassy mount. the price was reasonable, and they are just as good as the pricy name-brand filters. the Hassy shades have a bajonet also and work perfectly with or without the filters.