- This macro extension tube is suitable for all M72 x 0.75mm Screw Mount Cameras; - This macro extension tube can turn an ordinary lens into a macro lens and adjust the Flange focal distance. When installing, connect the Camera at one end and the lens at the other. It can be used alone or in combination to achieve the change of Flange focal distance. The longer the length of the Flange focal distance, the greater the magnifying effect; - Auto-focus function cannotoperate. Specification: - Male thread: 72mm x0.75mm - Female thread: 72mm x0.75mm - Color: Black - Material: Aluminium.