I’m sure there’s a reblog or niftier way to do this, however, I’m just old (fashioned).
Strawberry Singh recently did a full tutorial with tips and tricks for SL Viewer 3. I don’t personally use Viewer 3 but the functionality is all contained in Firestorm as well if you look for it. The tips and tricks for DoF, Windlight etc are all the same though- also some comments about glitches and lines which I know a few people who read my blog and mightn ot read hers have an issue with.
Check it out