Thanks for the link Bruno.

What I am talking about is shooting on location, the idea I currently have is a shoot in a forest. I need to fill a large space with a light but lingering smoke/misty back ground. I think any smoke machine solution won't be able to output enough smoke before it's all gone.

I don't want the viewer to know I have added the smoke/mist I want it to highlight the light coming through the trees, or the light I add to the background to give my subject an interesting and dramatic backdrop to move through.

Maybe I'll have to do lots of trials before I do a shoot, I have seen the Antari M1 smoke machine which is the only one I have found at anywhere near a reasonable cost, maybe I'll find some where local who hires them out. I'll also have to get myself a few paintball style bombs I think.

Cheers

Cris.