Guys<br><br>Thanks very much for your prompt response - i'm impressed, will let you know if i succeed in getting hold of the elusive lens. I've seen guys using these things to start fires in hot climates before (unsure how powerful it would need to be in England : - )) - I guess if the diameter of the thing is small enough to fit into my tobbacco tin I might go for it - I carry a lot of kit in my pockets etc so my tin has become more of a specialist tool box to some extent. Once again many thanks.<br><br>Nik T.