Hi Norty,
Yes we have spoken on another thread and I followed all the advise, I never even took my last laser out commercially as a result and went out and spent the money on a very decent laser system that I'm really happy with. So many thanks for putting me in the right direction. As I said I know measurements have to be taken on site and have been made aware of the pitfalls. But before I go out and get the whole set of lenses, and only having the -d 6, I'm just trying to get a rough idea of what to expect, I have the power measurements, I thought that may help a little. Once my bank recovers from buying 2 lasers, I do plan on getting a power meter and going on some courses.