|Hello Laurent. I´ve read about Tamron 90 2.8 macro and yes it is very good.
About Dexia rustica, I´ve edit my photo with some information: It belongs to the family Tachinidae. Their larvae parasitize the larvae of Coleoptera: Melolontha melolontha, Amphimallon Phyllopertha solstitialis and horticultural.
Overwinters as larvae in the body of the host. Adults fly from early July to September. They have one generation per year. Adults feed on nectar from flowers.
They are useful for agriculture insects as beetles larvae damage roots mentioned lettuce, potatoes and other vegetables.
Thank you very much.
Dexia rustica (18)