I recommend these products from Badger Ordinance, once you find one (Whatever you decide on) or how to get your hands on a Hensoldt:
SLICK-H: (Killer)
https://www.eurooptic.com/Badger-Ordnance-SLICK-H-for-the-Hensoldt-Spotter-46-and-60-600-20.aspx
SLICK-H Protective Lense Cover: (a “Must” if...