Nudibranchs from Tulamben (Bali, Indonesia) - Underwater macro with a cheap cellphone

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Even a cheap cellphone (Xiaomi Note 7) can produce acceptable underwater images. Diving around Tulamben, I found several colourful nudibranchs and sea slugs, from a few millimetres in size, to nearly 10 centimetres. Housing used was a Divevolk Sea Touch Pro 3, with and without AOI UCL-900 (macro wet lens). 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 and / or MiniGear MS-03, snoot torch.