Pentax 6x7 - Lens Care and Maintenance; Proper Lens Cleaning Techniques

67 lenses are high precision optical in-
struments and should be treated accordingly .
Protect them from humidity , salt air and dust;
do not store them in damp places. It is good
practice to protect the lens with a filter when
using it near the seashore and other loca-
tions where dust or moisture might accumu-
late.
Cleaning: Do
not wipe the lens with a hand-
kerchief or other rough cloth which might
scratch the surface. Use only a rubber blower
or soft brushes especially designed for lens