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Guess this is as sharp as it gets... Very satisfying shot as i had to follow the butterfly for 15-20 mins to get it settled and go REALLY close for this kind of shot!
Got few dew drops on the legs as well in the shallow DOF as a bonus :D
This is first time i have managed to capture the circled proboscis (that's what its called.. thanks to google: www.naturenorth.com/butterfly/english/01%20body.html)
here is an outtake where i can cover the whole butterfly at least in bokeh