The filter size of the Soratama 72 is 72mm. If it does not match the filter size of your lens, please use a step-up ring or step-down ring. | To focus on the ball, you need to be able to take close-up photos. Use a macro lens or macro extension tube. | Also purchase "ZENJIX Extension Tube 72" to adjust the length of the Soratama, which can be adjusted up to 55 mm in 5 mm increments. | For detailed product setting and usage instructions, please visit the Soratama Organization's website. | What’s included: Circular glass with clear ball in the center. Ball lens (optical glass). 1 piece of Soratama extension tube (filter diameter: 72mm length:20mm / alluminum). Made in Japan