Orbit - Not Using Centrepoint of Selected Geometry

[Aiden]

Seeing some unexpected behaviour in the 3D window. When I orbit (Shift+MMB) in perspective projection, AC orbits around a point near to the centre of the selected geometry. In parallel projection, however, AC orbits around a point near to the centre of the entire model regardless of what has been selected. Unfortunately, with the dimensions of the model as big as they are, this makes orbit behave more like pan!

Is this normal? Is there another way to control the orbit target point in parallel projection?

Thanks!