Many threads such as this can be found on the web archive, here is the thread as archived:
https://web.archive.org/web/20230127185242/https://wetpixel.com/forums/index.php?/topic/54607-do-15mms-need-servicing/&tab=comments#comment-399921
We do need to be careful copying threads as I believe we need the permission of each contributor to copy it, but we are free to link to it and the archive is likely to be more permanent.
There are various ways to correct colour in lightroom the most basic being colour temperature and tint adjustments. Colour temperature is blue-yellow and tint is magenta - green balance. So shifting to yellow removes blue and to magenta removes green.
The torch needs to be surprisingly bright as it needs to overpower ambient light, the best way to increase its impact is to have it much closer to the subject. The ultimate solution though is adding a strobe, which is way more powerful than a torch.
An alternative I have seen used around Sydney dive sites is a regular pair of specs without side arms mounted on a go pro type mask clamp on your mask that you can flip up and down as required.
I'm Chris Ross, from Helensburgh just south of Sydney, happy to be involved in establishing this new community, I was previously one of the Wetpixel moderators. I do much of my diving around Sydney so I can dive all year round and also enjoy dive travel. Look forward to establishing this site as a great resource for all interested in UW imaging.