If you are looking to protect your expensive Rollei Zeiss or Schneider lenses for your Hy6, AFi or 6008, I have two extra SH-PMC protection filters (Bay VI size). These are special order items. They are 100% Schott glass clear filters with SH-PMC coating (16 layer) from Heliopan. The top layer is coated to repel moisture and dust. There is no optical degradation, completely neutral, and no loss in f-stop. Check out the Heliopan website for more details.