The ARRI R4 Screw-in Reduction ring 114mm to 100mm for Fujinon XS8x4mm (Sony EX-3)
With internal thread for use with R5 reduction rings

The ARRI R4 Screw-in Reduction ring 114mm to 100mm for Fujinon XS8x4mm (Sony EX-3)
With internal thread for use with R5 reduction rings