Filters for optical devices; Lenses for astrophotography; Lenses for cameras; Lenses for cellular phone cameras; Lenses for photographic apparatus; Lenses for smartphone cameras; Optical glasses; Optical lens blanks made of glass; Optical lenses made of glass; Camera filters; Lens filters; Optical filters; Optical filters for screens; Optical lens blanks; Optical lenses featuring anti-scratch coatings; Optical lenses featuring multiple resistance coating; Photographic filters