Camera Tracking problem

i’m trying to get a camera to follow a half circle curve while pointing at an empty.
so i parented the camera to the curve, no problems.
but when i set a Track constraint on the camera, flips the camera 90
degrees so the camera is sideways! how do i control what the Track to constraint effects? i want the camera to track it using only one axis.

In the Track To constraint panel are buttons that orient the constrained object by defining both which axis points at the target and which axis is “up.” Setting these properly should fix the camera orientation. I think in general for a Camera it’s probably best to use -Z for the “pointing” axis and Y as up, but that may vary in your setup.