Thanks Guys,
I shot the film yesterday and I have to say that there were some tricky elements that I didn't expect. I got a lot of differing opinions on the magnification factor and can only estimate from looking through the lens that for S16 equivalent from 35mm stills you need to multiply between 2 and 2.5, which did surprise me. Sorry I couldn't be more accurate, I don't know yet.
Another surprise was how bright and sharp the nikkor prime lenses appeared to be. The only downside was that they are not designed for smooth movement and focus pulls. Some were better than others.
Anyway thank you all for your help and I will post an update once I know more. Hopefully the film will be alright as well.
Cheers
Pat