I have a Hoodman 3.0 and a Hoodman Neoprene Camcorder Strap that I use on the LCD of my 60D. Because the screen is articulating, the strap wraps nicely around the screen securing the loupe to the screen for a very sweet solution.

I discovered by accident that it works great when the strap is wrapped around an iPhone screen with the with the loupe attached.

Below is a short tutorial I made on Vimeo showing how it works.

Hoodman iPhone Stabilization on Vimeo

Let me know what you think.

Norman