Designed for macro photography, the Pro 4-Way Macro Focusing Rail Slider for Close-Up Shooting from Neewer enables you to make minute 4-way adjustments for precise camera-to-subject focusing. Two rails allow right, left, forward, and backward movements, and the unit's locking knobs assure rock-steady focus. This macro focusing rail enables photographers to position the camera and focus on the subject with the great accuracy, and this rail system can be used for all digital and film SLR cameras. Additionally, it is compatible with most Nikon, Minolta, Pentax, and Canon bellows, extension tubes, and macro lenses.