For wide angle (1.5' or > from subject) I use a non-auto setting because most auto settings will create way too much back scatter by using a low ISO and high flash output. Especially in productive waters like the Pacific Northwest where I dive. By using P (program) you can control the ISO and flash output. Try 400 ISO and use very little flash or no flash depending on the compositon and use a diffuser. Then go to 200 iso and compare. The lower the ISO the less grainy the image will be.
For macro (1' or less from subject) you should be able to use it on Auto..... a diffuser will help too....
Hope this helps and good luck,
Dave
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