Product 1: Essential for outdoor photography
Product 1: Deepens intensity of blue skies
Product 1: Reduces or eliminates glare
Product 1: 52 millimeter diameter
Product 2: The effect can be seen through the viewfinder and changed by rotating the filter
Product 2: Filter factor varies between 2.3 and 2.8, according to how the filter is rotated and its orientation to the sun
Product 2: Best results with SLR cameras
Product 2: Designed for lenses specifying a 58 millimeter filter thread size