Folding hood on the 4x5 with a proper hood-length loupe. No dark cloth at all most of the time. Throw a jacket or dark shirt over your head if it's too bright out.
What sick things are you guys doing under those clothes? Frame it up, focus, adjust movements, check again... What's that, 30-45 seconds? (With a proper camera of course, not one of those flimsy wooden toys with obscure controls and fiddly movements.)