It's a special bracket combined with the latest Varavon EX-Solo Loupe LCD Viewfinder to work with the GH1/GH2 cameras vari-angle LCD screens. This will allow you to still have full tilt use of your LCD screen for low angle shooting, magnify the image on screen, and provide shade if you're working in bright sunlight. Using a loupe also gives you a nice little stabilizing point of contact if you're shooting hand held or on a small rig. There certainly isn't too many LCD Loupes for the GH1/GH2 cameras, mainly because people have been happy with the mini EVF eyepiece resolution. But if you had to choose one for these M43 cameras, I feel Varavon makes the best. Of course it's also one of the priciest. Find more of Varavon products available at B&H (click here).
Here's a better look at Varavon's latest Loupe Viewfinder. This one has a 180 degree flip up loupe that will provide you shade from the sun, even when you don't need a magnifier. The lens is glass and has a diopter to adjust for vision imperfections. Solid build with metal mounting brackets that can be positioned to fit a variety of cameras. The bottom thumb knob is all metal with a large base so that you can position a quick release plate underneath without wobbling.
The view finder is a solid choice amongst some of the other high end brand names, and is available for Canon, Nikon, and Panasonic GH1/GH2 cameras. Varavon also makes DSLR sliders, Cages, Video rigs, and other viewfinders. I'm extremely fond of their cage. Simple, ergonomical, functional, and lightweight. You can find more of those Varavon products available at B&H (click here).
Varavon shows it's latest Loupe EX Solo View Finder on a Canon 60D. The Loupe EX Supporter (metal bracket) was designed to work on swivel LCD cameras such as the GH2, 60D, T3i. Without the Supporter bracket, the new Loupe EX can be mounted on cameras using a metal frame at the tripod mount. The Supporter bracket is not yet available through B&H, but the Loupe EX Solo are already available (click here).