I'm not sure if I understand your question exactly.

If you select the main camera, the x_tran and z_tran numbers should show you how far away it is from your figure (assuming it is in the middle of the scene... if it's not, then you'd have to pull out good old Pythagoras to find the distance between the two). I wasn't aware of camera distance making images out of focus though, unless it's veeeery far away.

Or is your problem that you have the preview window at 3000x4000 and so you can't really see how the camera is aligned? In this case, you can resize your preview window to fit your screen and then just click the little arrow underneath the camera movement buttons. Somewhere in that menu, you can specify the render output size and set that at 3000x4000 (keeping the preview window at 750x1000 for example).