Often, you want to balance light intensity between two areas within a scene. This is important outdoors to allow more sky detail while properly exposing the foreground. Exposing for the foreground will produce a washed-out over-exposed sky - exposing for the sky will leave the foreground dark and underexposed.
Digital HT filters are a state-of-the-art technological breakthrough in multi-coated photo and video filters. Made for the discerning professional and imaging enthusiast, Digital HT filters with Hi-Trans Double-Sided Titanium Multi-Coating surpass even military specifications for hardness and durability.