Geometric Backside (HBBBT!)
Some kind of shield bug, I guess?
UPDATE: Identified by Michael Marlow as a Plant Bug (family Miridae). Thanks!
UPDATE2: Identified even more precisely by Jean-François Roch as Taedia Scrupea. Thanks!
Pentax-M 135mm F/3.5 plus reversed Sigma 24-70mm F/3.5-5.6, but I don't recall what was the zoom setting, so I don't know the exact macro ratio.
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