If you simply use a blue filter to emphasize blue, the entire photo will have a blue cast. Blue Hander mainly makes blue more vivid and increases saturation. It is suitable for emphasizing the blue of lightly cloudy skies and oceans. /[77mm Blue Hander]77mm Blue HanderIf you simply use a blue filter to emphasize blue, the entire photo will have a blue cast. Blue Hander mainly makes blue more vivid and increases saturation. It is suitable for emphasizing the blue of lightly cloudy skies and oceans. □