My shot was taken in sunshine, which intensifies the colours more than cloudy conditions but compare, especially, the blacks. On the insects themselves the black is a really solid colour.
It's definitely worth playing around with a few exposures to get them looking as they should, whatever the histogram says. I usually have a 1/3 stop under-exposure dialled-in to avoid washed-out colours but often select 2/3 if there's no lighter areas present (mind you, the 20D isn't the best camera that Canon have made as far as spot-on exposure is concerned!)
When you get them this big in the frame ther's no problem id-ing them - get a Common Blue side by side with the Azure and you see how many differences there really are. It's not just the 'U' shape on segment 2 - there's the extra 'half-stripe' on the side of the thorax on Azure plus the shape of the black areas down the abdomen and the bit of black on segment 9 which is all blue in Common. There's 'Sticky' thread over on BF insect dept. showing the differences
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