Fangrui Product Details 1. Square Housing Diving Color Lens Filter For Insta360 One R 4k Edition 1 Inch Dition 2. Made Of High Quality Abs Material, Durable To Use. 3. Choose Professional Lens And Excellent Lens Grinding Process To Make The Image Clearer. 4. Prevents The Harmful Effects Of Uv Rays And Eliminates Smog, Correcting The Chromatic Aberration In The Landscape Photo. 5. Capture Your Footages With The Right Color Lens Filter According To Different Condition: 6. - Purple Filter: Purple Filter: The Purple Filter Is Color-corrected When Shooting In Green Sea Water With A Depth Of 5 To 25 Meters. It Is Ideal For In Freshwater Lakes, Fresh Reservoirs Or In Salt Water Where Because Of Green Algae To Take Pictures. 7. - Red Filter: Red Filter Can Be Used Around Noon (sunlight Direct Water Surface) In The Water Depth 10-20 Meters, The Main Purpose Is To Reduce The Red Absorbed By Water, Effectively Improve The Blue Phenomenon Of Underwater Shooting, Restore Color Balance, Prevent Shooting The Image Too Blue Or Too Green. 8. - Pink Filter: It Is Used To Filter Blue Light, Improve The Contrast, Restore The Color Of Blue Water, And Obtain Rich Natural Color To Produce Warm And Accurate Color. 9. - Red Filter For The Bluish Environment, Purple Filter For The Green Environment, And Pink Filter Can Restore The Color Of Blue Water To Obtain A Natural And Warm Color. 10. High Transparency, High Color Reproduction, More Exciting Photos. Waterproof And Scratch Resistant, Effectively Protecting The Lens.