Occasionally one of these weird green blowflies get trapped against the big gable skylight in my studio. I picked this one up the other day, set him up with a light and took some photos. I used an old 28mm vivitar close focus lens with a 1.4x converter. It is a great, sharp lens and despite it 30 year+ age, still works perfectly on my Pentax K20D. All functions are manual, but the camera will still automatically set the speed to suit the selected aperture. It also beeps and flashes a red square indicating where correct focus is occurring. Not bad for backwards compatibility!
They sure look interesting when you look at them this close.