Hello Edward,

thanks for the thought, I used 1.52 (crown glass) for the refractions. I think that I just need a little more practice in setting up and rendering caustic / refractive things, it's not something that I've really got into as of yet. Well rendering in general is not a forte of mine but it's something that I was looking to explore a little with this thread (which I had got totally side tracked from), perhaps I'll take it up again and see if I can make any progress.

Cheers,

Mat.