If you could capture one alive and put it in the refrigerator for a little while, that would slow it down without any long term harm to it. It would be more artificial set up, but it would let you get a decent photo without them flitting off.I spent an hour or so this morning trying to photograph blue wasps. There were dozens of them flying around a hedge but the damn things never land and are very fast. This was my best effort. I think I will also be on some kind of watch list now, I was getting strange looks from passers by.
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