Kowa's 72mm Clear Protection Filter shields the most important and sensitive area of your spotting scope: the objective lens. Sand and dust particles can cause scratches to the multi-coatings, and an accidental fall can cause irreparable damage. This type of damage is expensive to replace and significantly decreases optical quality. The 72mm filter drastically reduces the risk of objective lens damage, and prolongs the service life of your spotting scope. This Protective Filter is compatible with the Kowa TSN-660M Spotting Scope Kowa TSN-660M Spotting Scope 72mm Multi-Coated Clear Protection Filter TSE-FL66