Leica 50-200mm lens at BHphoto, Adorama, Amazon, Panasonic.
This is Richards take on the new Panasonic-Leica lens:
For 100% crop and more sample photos, please visit his website: photobyrichard.com/reviewbyrichard/panasonic-leica-dg-vario-elmarit-50-200mm-f-2-8-4-0-asph-lens-review/