Don't use a flash with this but use a lamp or something bright to illuminate (I used the camera flash on my phone) it you can see in this picture where I cut out a section for the light to shine through and the hole for the vice to go through. [img]http://i140.photobucket.com/albums/r30/jack01986/DSCF1060.jpg[/img]
You can put some tinfoil on the bottom to help illuminate it from below as well. I take the picture in macro mode and try to fill the frame with the fly. Id use a mini tripod if I had one to keep it steady. Once you get the hang of you can take the pictures without the device. I also use picasa software from google to sharpen the up if i need to (its free). You can get some good pics with a fairly simple setup. The first one probably needs to be sharpened up a bit and the second one is the best one Ive done so far.
[img]http://i140.photobucket.com/albums/r30/jack01986/DSCF1056.jpg[/img]
[img]http://i140.photobucket.com/albums/r30/jack01986/DSCF1049.jpg[/img]