It does take the blur off the edges of the stones though. I'd not tried the idea of bumping up the radius first, then doing another pass with the radius down, I always do low radius, then now else, so I tend to end up with noisy skies. In the case of that Callanish pic, the sky was noisy as feck.

Mind, I know what you're saying about monitors. My desktop one is right next to the window, makes colour managment for printing a right pain too.