This is a feature that has always intrigued me about certain Olympus mirrorless caneras and I have not seen it on any other brand of camera.
It allows you to use the “Live Bulb” mode of the camera to do a long exposure and watch it form on the LCD screen.
At a workshop at the Silk Mill in Maryland, I first saw this done by one of the students in a virtually light free environment. It was done by Greg and the final image was incredible. So for all of you Olympus enthusiasts you should give this a try if you have one of the OMD series cameras.
How to use Live BULB on Olympus OM-D cameras. Live BULB Video of the feature in action and step by step tutorial to get you set up fast.