Buy from Amazon.com : http://fave.co/1O5APoC <br /><br />Zeiss Super Wide Angle 21mm f/2.8 Biogon T* ZM Manual Focus Lens for Zeiss Ikon and Leica M<br /><br />Product Description : <br />13 stop interval click stops allows for exact exposure <br />Precise 10 bladed aperture creates pleasing unfocused highlights <br />Wear resistant filter mount for long-term reliability in tough conditions
