Abstract: A picture taking apparatus is provided which accurately positions a camera lens with respect to the object being photographed. The apparatus comprises in part an element which is supported on and moves along a track. The track has equally spaced parallel pins extending in one direction therefrom and complementary indicator marks located on one face thereof. The element has a carriage which slides horizontally along a shaft of the element which is parallel to the track. The carriage has a cam-operated plate which slides vertically in said carriage to engage and disengage said pins. When the cam-operated plate engages a pin, the carriage is "fixed". This provides a "coarse" adjustment for the position of the camera lens. For the "fine" adjustment, the element is still free to move along the track. The element can be moved along the track to "fine tune" the position of the camera with respect to the object to be photographed.