I am new to the D7000. I have the these settings: AF-A, 39 point sensor chosen, but when I look through the viewfinder, all I see is one central oval indicating focus point. I have evidently set something wrong. I thought I would see all the 39 points indicated in light outline with the ones in active focus in bold. I don't see any of the 39 focus points showing on the viewfinder, just the central one.