John from Gates kindly responded to my question on the iewfinder for the FX7 housing as follows:-
The housing viewfinder is a simple non-magnified window that accommodates the height difference between the FX7 and V1. With the rubber boot removed the viewfinder image as observed through the window is actually one of the best we've seen from Sony. If you're accustomed to shooting this way I expect you'll be pleased.
For those that aren't our new EM43 hi res monitor is available. Like all Gates monitors it is mounted to the top (or side) of the housing for flexibility. You can move and pivot the monitor in any direction for comfortable shooting.
I then asked about the spacing between the camera and the filter re the use of a w/a converter, he repiled as follows:-
The short answer is: none. The filter rides immediately in front of the camera, so adding a w/a converter onto the camera prohibits use of the filter.
The reason it's positioned this way may not be apparent, but very important. It's because of the SWP fathom port must be placed as close to the camera as possible (much like your w/a lens that affixes to the camera). By doing so the port achieves 'no compromises' performance, and we can hold alignment tolerances very tightly (which is necessary to preserve that performance). So, a very small gap (4mm) is allowed between port and camera for the filter.
That said, I expect you can use the w/a converter, just not with a filter.
Thanks to John for his help and not intruding on our Forums
Joe from Marine Visions also responded with a close up of the viewfinder which confirms John's comments. Thanks Joe.
Roger