Photography device installed in e.g. swimming pools, fitness club, moves optical grid along optical axis of light source such that movement path is either elliptical or rectangular

摘要

An optical grid (12) is arranged between a light source (7) and the object (6) such that light passing through the grid gaps is made to fall on the object. The optical grid is moved along the optical axis of light source, such that the movement path is either elliptical or rectangular.