18043-UNF-IK External 1/2"UNF20 Optical TTL-Converter for SONY A1-A9II family cameras for IKELITE underwater housings

External 1/2″UNF20 Optical TTL-Converter for SONY A1-A9II family cameras for IKELITE underwater housings.                                          Installation in 1/2″UNF20 threaded hole on the top of the housing nut. Compatible underwater strobes: Inon S-220 / D-200/ Z-330 / Z-240, Sea&Sea YS-D130R (including HSS)/ YS-D1/ YS-D3 Mark II/ YS-D3 DUO, Retra Pro MAX/ Pro MAX II (including HSS), Marelux APOLLO III V2.0 (including HSS)/ APOLLO-S (including HSS)/ Apollo-Y (including HSS). USER MANUAL