I am curious. what do you use as a white card underwater, as well as some general techniques on how you use it.

I always shoot RAW but I still like to get it close for the fast conversion process.

chris

Most of the time I use the sand around me, it works great:

I use WB=4800K as my starting point for everything.

There are some musings on the subject on this webpage:

http://www.magic-filters.com/wb.html

Alex

thanks Alex! that link told me what I needed to know.