Product 1: The effect can be seen through the viewfinder and changed by rotating the filter
Product 1: Filter factor varies between 2.3 and 2.8, according to how the filter is rotated and its orientation to the sun
Product 1: Best results with SLR cameras
Product 1: Designed for lenses specifying a 58 millimeter filter thread size
Product 2: Essential for outdoor photography
Product 2: Deepens intensity of blue skies
Product 2: Reduces or eliminates glare
Product 2: 67 millimeter diameter