I purchased beautiful G9 Canon and WP-DC 21 housing. Camere it self is “dream come truth”.
After a months of experiments I descided to go for external strobe. What can be combined with Canon housing? Should I go for “slave” or block the built in flash with optical cable?

Zokika

http://www.fotozine.org/?omen=Zokika

Ikelite’s strobe packages that include the manual controller will work with your rig, as will Inon’s strobes with their fibre-optic synch cords.

You will want to block the camera’s flash from going forwards and hitting your subjects irrespective of the strobe solution you use - if you don’t, you may still get backscatter, thus defeating the purpose of the external strobe.

There are probably other strobe manufacturers that offer some sort of fibre-optic sync or a system similar to ikelite’s manual controller.

One of my students purchased a neat fibre optic cable adaptor that fits the Canon WP-DC21 housing, she purchased it from Yuzo at uwdigitalcamera.com in Japan, here is the link to it http://www.uwdigitalcamera.com/goods_detail.php?goodsIdx=248
Its probably the best method I have seen of attaching a fibre optic cable, it can also attach directly to the 67mm thread adaptor (for Inon 67mm macro lenses) which also fits this housing.