Some excellent explanations there, Tim and Alex.

Just a slight correction, if I may.
With MTF type adaptors, technically and practically there is no light loss.
Yes, not all of the light from the lens is being used, but intensity, nonetheless, remains the same.

The JVC adaptor increases this intensity, DOF adaptors will lose some via the ground glass, whereas our Nikon to 1/3" adaptors do neither.

I have some remarks, regarding to the HZ-CA13U adapter;

1. Some lenses require constant white shading (for every F-stop, a different white shading level). This was the case with the Canon S16 8-64mm I have used. You could use some specified scene files for this.

2. You would need some kind of handgrips, attached to 15mm rods, to be able to handle the front weight of larger lenses (like the Canon I've mentioned) in a good way. I use a set of Cavision, which is not the best you can get, but they'll do the job.

3. Don't expect miracles from the reduced Depth-of-Field at 16mm lenses. It's by far not as dramatic as you would have with 35mm adapters.

In addition:

2. As well, you will need to use the top or side record start button as the one on the zoom lens will obviously no longer exist.

3. The DOF will be VERY similar to that of 2/3" cameras (same size imager as 16mm).