matikiller

Hello, i was just wondering what the last "zoom in" is in the bmd-2m sight. As i understand there are 2 zoom levels after the initial one however, if you click the plus key again, it does not zoom, instead some letters on the screen change and there is a little shake, i would like to know what that is since i tried translating it and still could not understand. I would appreciate some feedback. Thank you.