It's not my method and I owe a debt of gratitude to Bruce Norikane to use his adaptation fo a drink cup. My cup is a drink cup from Sam's Club.

I take my cup, the electrical clip and my camera with me to fly tying events. I can use my tying lamp to take photos of other tyer's flies.

Here's a hand held photo I took just the other day of a fly I tied. It is an upside down fly that rides hook point up, so flip the image over and that's how the fly rides in the water.