|Polyommatus eros, male, the underside.|
When taking pictures of Lycaenids, I always find it helpful and often even necessary to make a documentation of both sides of wings. Without seeing the undersides of wings it would be practically impossible to identify many of the similar but different species of blue Lyaenids living even in Europe alone - where we may count as many as approximately 30 species just of genus Polyommatus.
Location: Mountain meadows of Grossglocker, at an elevation of 2250 meters.
Camera: SONY DSC-H5, 3072 x 2304 pixel, sRGB, 18mm macro (= 108mm at 35mm SLR), F/6.3, 1/200sec., ISO-125; exposure bias: -0.3, no tripod, no flash; 26.08.2007, 14:35.
Hope you enjoy.