
Even a cheap cellphone (Xiaomi Note 7) can produce acceptable underwater images. Among others, I found two Hypselodoris tryoni nudibranchs - quite beautiful -resting on the sea bottom in Tulamben. This species has a trailing behaviour, meaning, one or two of them constantly follow a leader. They are not really couples, as nudibranchs and sea slugs are hermaphrodites. .Housing used was a Divevolk Sea Touch Pro 3, along with AOI UCL-900, (macro wet lens) and a DIY tripod. And all the settings (Aperture, speed, white Balance and ISO) were manually selected.
It was coupled with 2 DivePro Vision Pro+ UW lights (15.000) lumen each, and blue filters.