UW Technics External 1/2"UNF20 Optical TTL-Converter for SONY A9III (camera with global shutter) for IKELITE underwater housing

External 1/2"UNF20 Optical TTL-Converter for SONY A9III (camera with global shutter) for IKELITE underwater housing. Installation in 1/2"UNF20 threaded hole on the top of the housing + nut. Compatible underwater strobes: Inon S-220 / Z-330 / Z-240 / D-200, Sea&Sea YS-D1 / YS-D3 Mark II/ YS-D3 DUO, Retra Pro MAX (including HSS), Marelux APOLLO III V2.0 (including HSS), Marelux Apollo-S (including HSS). Maximum sync speed in TTL mode with global shutter cameras - 1/500 s. Maximum sync speed in M / HSS mode with classic underwater strobes - 1/2000 s. Maximum sync speed in M / HSS mode with Retra Pro MAX and Apollo strobes - 1/ 80000 s