E-M5 has the wedge in the front half of the housing (to deploy the onboard strobe if you forget) which would prevent the flash trigger from fitting into the housing. The E-M1, E-M5 II and E-M1 MkII all use the taller removable strobe that does not require the wedge to pop it up. I use the Nauticam flash trigger with my NA- EM1II Nauticam housing. With the camera set to C-AF TR and Sequential High setting I can hit 18 properly focused frames per second using my Inon-240 strobes at about 1/4 power in manual. It is quite impressive and beats many of the much higher cost full frame cameras.
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