David from Photoclub Alpha posted an in-depth review about the Sony Alpha DSLR-A350 Live View Report.
The difference between the Olympus method and Sony’s system is that no light is lost from the A350 optical finder, as a physical switch changes the lightpath instead, blocking off the viewfinder with a shutter. At the same time, the lower front face of the this mirror prism shifts its angle and position slightly; this diverts the view of the focusing screen to a CCD and lens assembly positioned to the left of the eyepiece, via a 45° mirror prism placed above it.
The report also mention the following
Read the full report: Sony Alpha 350 Live View tested