Where did you find the Fresnel lens? I found some at MUTR for 29p.

They also have other interesting materials and kit, mostly aimed at teachers. I am trying to decide if I really need a geiger counter. <img src="/images/graemlins/tongue.gif" alt="" />

http://3dlens.com/

Hi
I must have got my pricing wrong in my original post - they were next to nothing, I remember that....Same place though. The only snag being the postage cost ?2.50ish.., so I ordered 5 lens just to make it worthwhile. Even so, the postage still cost twice as much as the lens did. <img src="/images/graemlins/frown.gif" alt="" />
If it wasn't for the direct link to the len's from google, I doubt if I would have found them - I had a hard time navigating back to them - they seemed well hidden....prehaps its just me? <img src="/images/graemlins/blush.gif" alt="" />