>>4318742ISO 6 is basically worthless
Photography is basically impossible under 20 iso besides some super autistic studio work or wanting to do a 15 minute long exposure in broad daylight like that first photo of the guy getting his shoe shined. If you want low ISO start with PANF 50 iso and if you like that try RPX 25 (this requires its own developer I think though).
Pic rel is a high res scan of PANF