I don't understand how this works. If it's a transparent display that just passes through light and adds some overlay information (like a viewfinder on d/SLR cameras of the old), then doesn't the frame change completely depending on the distance you're holding the device at in relation to your face? It can't be meant to be used with your arm fully outstretched, because that would be an impractically narrow field of v…
If you care those things mess up your framing of the shot then you probably don't want a flat $29 camera.