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 58mm filter thread size
Product 2: Most popular protection filter
Product 2: Provides basic reduction of ultraviolet light
Product 2: Helps eliminate bluish cast in images
Product 2: 58 millimeters diameter