Just got/getting some new lenses and the old protectivce filter or not choice comes up. Particularly with Zeiss lenses, which are quite warm anyway, what is completely neutral i.e. purely for protection. Do Heliopan or B&W UV filters fit the bill,or do I need Hoya Pro 1 Digital protector. Wouldn't normally bother but do a lot of stuff on the shoreline with salt spray breaking over me.