You suggestion worked, but now the camera seems to shift a bit to the left like this:
and here's the camera's def:
[Camera]
startx = -470
starty = 0
boundleft = -950
boundright = 70
boundhigh = -80
boundlow = 0
verticalfollow = .6
tension = 50
So what values need tweaking? It's not noticeable, but if you look at the castle's bridge at the upper left you can see that the camera moved slightly to the left.