Last two days Amazon made subtle price adjustments. I've seen this lens (sold by amazon.com) at approx. 820$ and now we are down to 770$. I've read very positive opinions on this glass. And myself consider getting some UWA zoom, but my primary interest was for Nikon DX glass - Tokina 12-24 f/4. May it go even lower? I guess Panasonic feels the pressure from growing NEX lenses family.