A55 & A77 LCD/EVF
The rear display attachment is very flexible. A little quirk is that the automatic switchover to the viewfinder is disabled when the rear display is not flat against the camera back. This is obviously to avoid switching to the viewfinder when you flip the screen up and cover the viewfinder sensor with it. But this feature may surprise you when you have the display flipped down, look into the viewfinder, and nothing happens. Luckily, there is a button on the camera to override the automatic switchover.