Smooth shading problem
 

I seem to have a problem with smooth shading in the viewport.
Here's the same polygon sphere with different subdivisions in the
height and axis.

Inputs
polysphere
Subdivisions Axis 13
Subdivisions Height 13
http://homepage.eircom.net/~Sharpsho...ere_smooth.jpg


Subdivisions Axis 12
Subdivisions Height 13
http://homepage.eircom.net/~Sharpsho...alf_smooth.jpg


Subdivisions Axis 12
Subdivisions Height 12
http://homepage.eircom.net/~Sharpsho...phere_flat.jpg



It seem like there's a threshold before the smooth shading turns to flat shading. Is there some way to increase it? Or is there another solution to my problem?

Edit polygons -> Normals -> Soften/Harden normals -> All soft.

Oops!! I thought that only affected renders.:)
Thanks for the tip.