I am using OM-D in Nauticam housing and YS-D1 x2 , have got some questions and wish some of you can help:
1) what are the differences between "flash" , "pre-flash" and TTL mode ?
2) does the TTL mode of YS-D1 work on OM-D ?
3) I am connecting the two strobes directly to the the housing , but the user manual suggested connecting one strobe to the other , what is the diff ?
4) the strobes doesn't always sync....would it help if I use electri. sync cord and bulk head instead? what are the limitation ? no TTL ?
Thank you so much~