Is there somewhere, other than the lacking Blender documentation, that explains the reasoning behind the Target > To and Up axis configuration for the “tracking to” constraints? Seriously doesn’t make sense to me.
What exactly do you not understand? The To axis is the local camera axis that is pointing to the target. The Up axis is the local axis that is pointing upwards.
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Yes it’s a bit confusing. First you need to choose Transform Orientations > Local. Now you see the local axis of your object. In the Track To constraint panel you need to tell what is the axis that is supposed to point to the target. For a camera it seems to be -Z (and not X as it is by default when I gave the constraint). And you need to tell what is the axis that points to the up direction, for a camera it seems to be Y. I don’t know why these are the local directions for the camera in Blender though (same mystery for the bones orientation), there must be an explanation.
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Thank you Moonboots! I wish I knew why Y is up too 
But now I know!
For the camera there is an easy explanation (i hope its the real reason). In a 2D Image the X is to the right, Y is up. So the image plane of the camera follows this convention. Due to Blender using a right handed coordinate system, the Z axis has to go backwards.
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oh ok, thanks, but as it’s mainly used in 3D setups they could have changed to a more logical axis…
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