concerning the depth of field if all movements are zeroed, the near and far limi t with reasonable focus will be parallel to the film plane, with plane of focus perpendicular to the film plane, but: 1/ what will be the shape of the "depth of field area/volume"? will it be a cycl inder made of concentric circles ,or just "rectangular block"? 2/ then what will be the "depth of field area/volume" if movement adopted, e.g. tilting or swinging? thanks