Recommended FF Camera for RAW file Ambient Light White Balance in Post in Photography Gear and Technique Posted April 8 20 minutes ago, vaidhy said: You can use the filter with WWL-1. The magic filter can sit inside the lens or you can use the Keldan red filter for WWL-1 which is about twice as expensive. If you choose to use strobes or other lighting source (including the sun, shooting close to the surface), it makes things more difficult. Edited: Just did some more reading (https://www.uwphotographyguide.com/underwater-photography-filters). It looks like the filters only help in a fairly narrow depth range where you have enough red, but too much blue/green. Beyond that, you would need a light source or live with blue photos Thanks @vaidhy for digging that article up. It's a good read.