Also on the DoF question it depends on how far you are from the subject.
For 31cm (12") in front of the lens the subject would be at 41.5cm from the sensor, giving 1.49cm (19/32") depth of field for your camera.
(This is a handy calculator:-
Online Depth of Field Calculator)
Camera, film format, or circle of confusion = Nikon D70
Focal length (mm) = 105
Selected f-stop = f/32
Subject distance = 41.5 cm
Depth of field
Near limit 40.8 cm
Far limit 42.3 cm
Total 1.49 cm
In front of subject 0.73 cm (49%)
Behind subject 0.76 cm (51%)
Hyperfocal distance 1733.2 cm
Circle of confusion 0.02 mm