Been looking around a bit for neutral density filters for my 500cm and the bay 60 lenses I have for it. I'm obviously missing something because I cannot seem to find anything. Somebody have a recommendation for me please? Something that would give me perhaps 4-5 stopsI think would be adequate for longer exposures in daylight, yes? I have yet to even see any Hasselblad brand ND filters, did they ever make any? Any brand will do of course, but curious about native brand ND filters. Or the seeming lack thereof. Thanks in advance.