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As a matter of fact I use two lenses.
Usually I employ my Sigma 180 mm., together with Kenko auto-extension tubes (the three of them) and Sigma ring-flash 140 DG.
Some times, when insects are "relaxed" early morning/late evening I use my Nikkor 60 mm., with the tubes and the Sigma flash.
Obviously the 180 mm. gives me longer focusing length but then I need to use a small (housemade) monopod to assure an optimum stability.
Rafael