Voigtlander Super-Wide-Heliar 15mm f4.5
The Voigtlander Heliar 15mm f4.5 (LTM mount) is indeed a little gem. The wide-angle is sharp from corner to corner. As a rangefinder lens, it is compact too. On Sony NEX-6, it demonstrates minimal color shift.
Ohhh I really hate how much I love pictures!!! Have you ever been north to Inner Mongolia and done the desert?
WOW! Eyepopping!