I recently bought a Linhof Technica IV - my first entry into LF. The holes in the lens boards with the three lens' I got with the camera are not in the centre but towards the lower third of the board. I assume the image circle is squarely aligned to the film plane at "zero" settings. Is there a special design reason for this? Does it provide additional flexibility in movements etc. that are not immediately obvious to me? Appreciate your feedback. Thanks.