Not that Hal Hartley is comparable to tarkovsky, but they would both be in the same art house cinemas at the same time ;-) he is another director I admire from cinematographic perspective.
Hartley had a real minimalist camera style. He liked to shoot everything with the same focal length lens - close to what we consider 'normal'. While he was a low budget indie director, I remember for one of his films he had a window and part of a wall removed so he could shoot from outside and not have to use a wide angle lens! He felt that changing focal lengths broke the connection to his storyline. As a dusclaimer, I guess another similarity between these two directors is that lost of folks find them pretentious and ponderous so YMMV :-)