Unfortunately I dont have an adaptor tube, the only one I have is a skylight and that screws into a thread in the lens hood
yeah but thats what I mean.
With my fuji I can unscrew that lens hood so I call it an adapter tube
. But all you need is a stepdown ring to fit your lenshood to your lens. It screws in just like your filter.
All you need to make sure is that at full zoom your camera lens doesnt hit the other lens in front of it, which... if you can fit a filter on it anyway, means it wont. So just buy a stepdown ring of the right dimensions.