Hi there,
I have one of these cameras which can be seen here:
http://www.bigbluewave.co.uk/Super8/nalcom_ftl_1000.htm
Sorry about the rubbish pictures, I had what must be the worst digital camera in creation!!!
As you correctly mentioned, you need an adaptor to mount any other lenses on the unit. The adaptor is called a "SLR-Lens Adapter Model-101" and has a 42mm thread. The camera itself if fitted with a very large thread and includes a (rather under-powered) drive pinion for the power zoom.
I've found the camera rather awkward to use in a candid manner, the viewfinder, whilst bright isn't the easiest to focus with and the excuse for a handle is worse than useless.
Also you can't change the batteries without re-setting the film counter as they are inside the cassette chamber! I think they reckon on you using rechargables and using the charge socket on the side.
That said, it can be pressed into service in all sorts of unconvetional ways! It will interface with a telescope or microscope just by butting the camera body up to the eye-piece!
With different lenses fitted, focus range can be a bit limited and I'm not sure what the result is but it must be getting on for double the 35mm equivelent focal length maybe.
I'm looking at trying a new optical printer set-up to shooting of the gate of my Elmo GS1200 with a an extension tube, synched up via the flash socket next....
Keep shooting the "reel" stuff!
Ben