Or worse still was sat in the classroom, 4 pairs (snipers and observers....., they took it in turns on a day to day basis) around a table and as sure as god made little green apples, the lens parts or cells get mixed up.
It's a good point raised by Simons illustrations and I think the CORRECT assembly of the Sct Reg Scope might be one of my little photographic articles. If you can hack my crap photography. Just as a matter of interest, with the separated (left separated for a good optical reason) lens pair we used to put a bit of spit into the concave of the plano concave lens to see which side of the double convex lens was the best fit. Will explain all later.Information
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