Large format portraits with shallow focus
One thing I have not done much of with the 4x5 is precision portraiture. But I am now thinking of doing a set of portraits of my numerous older siblings. One of the looks I want to experiment with is the very shallow depth of field, with super-sharp eyes but quite fast fall-off of focus through the nose and ears. My concern with this is keeping the focus spot-on while closing the shutter, putting in the film holder, pulling the dark slide, and making the exposure. Apart from simply asking my sitters to keep very still, and working on my speed, are there any cunning tricks I haven't thought of? (A related issue is getting the shallow focus right in a 4x5 self-portrait with air bulb release...)
One approach would be to have the sitter sit with the back of their head against a wall, although that may pose problems with unwanted shadows.
Grateful for your thoughts!