NiSi Optics' new 150mm Explorer Collection ND filters claim to be twice as durable as other filters

NiSi Optics' new 150mm Explorer Collection ND filters claim to be twice as durable as other filters
NiSi Optics USA has launched its new 150…
Source: dpreview
NiSi Optics' new 150mm Explorer Collection ND filters claim to be twice as durable as other filters