.....David, many thanks, but trust me I'm not that much different to you
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Set up is the worst part no doubt, and I have lost it(patience) many times in various projects
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In nearly every case though, I've slapped myself on the wrist for being such an idiot and gone back to the problem at hand..........some more swearing and cursing and then it finally comes together
Today I popped in to the local Cash Converters store and picked up a compact lightweight 28-200 Tokina camera lens.........perfect for this spectroscope project (half the size and weight of the Tamron I have been fiddling with)...........how much?............$19.00 !!!!!!
I can only give one tip : never let anything beat you too easily.In most cases you are so close that you don't even know it until it dawns on you - days, weeks or even months later............such is D.I.Y
Cheers!
Rob.