Gary,
Thanks for that, I had read this all wrong, the QSI doesnt have a guiding chip, just a pick off prism...
You're right, that's not exactly what I am after.
Basically, at this point, in my fuzzy logic sort of way, Sbig has the top spot on the options list with nothing below given that it's the only one with a built in self guiding chip (i think its the only one?)
...
thanks
frank
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