The VetroSafe FlareFilter combines a didymium glass filter with our proprietary color correction optics to provide a camera filter that blocks the yellow sodium flare without causing a "purple-tint" in images as seen with uncorrected didymium filters. This 52mm diameter filter is has a large size suitable for flagship phones with multiple camera lenses. The rubber-lined clip that will not scratch your phone during use. Our custom-made blue anodized-aluminum filter ring is designed to correctly accommodate the extended filter thickness, enabling the filter ring to work correctly when stacked with other filters such as VND filters and with standard 52mm lens caps. Tip: For best results, it is recommended to use manual exposure controls on your phone or camera when creating video. Using automatic exposure modes may cause undesirable changes in brightness while filming. Note: Due to differences between human color vision and digital camera color rendering, VetroSafe's FlareFilter will appear to have a slightly greenish color when viewed with the naked eye, but has a neutral gray color when viewed through a digital camera. The light reduction from this filter is approximately equivalent to -1.0 F-stops. Use the filter in combination with a variable neutral density filter for best quality of video.