From Helicon Soft:
Helicon Remote is a utility that automates focus and exposure bracketing. The program changes focus distance by moving the lens with regular steps and takes shots. The stack of images is processed then with Helicon Focus to increase depth of field (DOF). Features include automate focus bracketing, automate combined exposure and focus bracketing, and perform tethered shooting via USB cable. Desktop version of Helicon Remote is available with Pro and Premium licenses of Helicon Focus.