Hi.. apology to revive this thread again..
First.. inspiring video as always EunJae.. Love it!!
I've just sold all my top side camera (Canon stuff) and underwater camera (RX100ii in nauticam housing) and replace all with the GH4. Currently I've Panny 7-14 and Oly 60mm macro for underwater and perhaps add the 8mm FE in the future.
I've ordered the Nauticam housing and its flat port for the macro stuff. But need some additional info for the WA side. I like EunJay's setup for its Nauticam GH4 and I think I would like to copy it, thus I do need some info:
1. The new 180mm glass dome port from Nauticam, is this the Nauticam 18809 optical glass wide angle port?
2. Do I loose zoom function if I use this 18809 ports? Since the gear that mentioned in the Nauticam's catalog for this port is only for focus gear?
3. Can I use this 18809 glass port with the Pany 8mm FE lens? Are there any drawback?
Thanks all.. Appreciate any comments and answers 
Bona