FYI/HELP - Lens Assemblies

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I'm new to all this and I don't know any math relating to optics and whatnot, so I'm bringing this information and my question here:

Are the projection lens assemblies available from <a href="http://www.sciplus.com/category.cfm?subsection=21">this page</a> on <a href="http://www.sciplus.com">www.sciplus.com</a> any good? They have quite a selection, and I bet that one of the assemblies will be useful for somebody. Somebody want to splurge and buy a few and report back on their visual quality and whatnot? Like I said, I don't really know how about the math involved with optics, so I don't know how to test these or evaluate them otherwise I'd do it myself. 🙂

-d
 
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