ronald weissman
Forum Enthusiast
As long as you're willing to use a flash in manual mode, using an external flash together with the VF-2 viewfinder is relatively straightforward.
1) I used a simple cold shoe bracket attached to the bottom of the camera.

These can be found in many camera stores, if the cold shoe is large enough for your flash. You may have to buy a separate cold shoe that fits your flash (I had to do this).

2) To use the flash that has optical triggering, do the following:
A) Set the flash to manual slave mode (for some Oly/Panasonic flashes, this is called servo or m-servo mode, as slave mode is a wireless protocol, rather than an optical protocol.)
B) Set the Vario X flash system to Studio mode, using the right arrow on the four way controller (which brings up the flash settings--set it to studio mode and confirm by pressing the menu button). Be careful not to accidentally reset this once you've set it.

Use the popup flash to trigger the main flash optically. You'll probably want to educe its flash compensation for the popup flash as much as you want (mine is set to minus 3) to eliminate its impact on the scene. The flashes I've tried 'see' the optical flash from the Vario X with no problem.
I have tried the Metz-52 (oly/panasonic version) and the Leica SF 58, a wonderful flash that can also be used in full TTL mode when attached to the flash shoe on the Vario X. (And the Leica SF 58 works really well in this mode).
Given the leaf shutter on the Vario X you can be quite creative with high speed shutter settings and readily overpower ambient light. You've full control of ambient light settings using exposure compensation, shutter and aperture controls, and using the manual settings on the Leica or Metz (both work well), it is easy to get your balance approximately correct using the histogram.
The whole setup is no heavier than a camera mounted flash and allows full use of the viewfinder. I'd be interested to see others' results with other flash setups.
Enjoy.
1) I used a simple cold shoe bracket attached to the bottom of the camera.

These can be found in many camera stores, if the cold shoe is large enough for your flash. You may have to buy a separate cold shoe that fits your flash (I had to do this).

2) To use the flash that has optical triggering, do the following:
A) Set the flash to manual slave mode (for some Oly/Panasonic flashes, this is called servo or m-servo mode, as slave mode is a wireless protocol, rather than an optical protocol.)
B) Set the Vario X flash system to Studio mode, using the right arrow on the four way controller (which brings up the flash settings--set it to studio mode and confirm by pressing the menu button). Be careful not to accidentally reset this once you've set it.

Use the popup flash to trigger the main flash optically. You'll probably want to educe its flash compensation for the popup flash as much as you want (mine is set to minus 3) to eliminate its impact on the scene. The flashes I've tried 'see' the optical flash from the Vario X with no problem.
I have tried the Metz-52 (oly/panasonic version) and the Leica SF 58, a wonderful flash that can also be used in full TTL mode when attached to the flash shoe on the Vario X. (And the Leica SF 58 works really well in this mode).
Given the leaf shutter on the Vario X you can be quite creative with high speed shutter settings and readily overpower ambient light. You've full control of ambient light settings using exposure compensation, shutter and aperture controls, and using the manual settings on the Leica or Metz (both work well), it is easy to get your balance approximately correct using the histogram.
The whole setup is no heavier than a camera mounted flash and allows full use of the viewfinder. I'd be interested to see others' results with other flash setups.
Enjoy.