Markus Wobisch

The Carl Zeiss Jena Sonnar 135mm f/3.5 lens is a compact tele lens, made of 4 elements in 3 groups. It is famous for being rather sharp, wit...

The Voigtländer Color-Ultron 1.8/50mm was built in Singapore from 1974-1977. The original Ultron (with the legendary concave front element) ...

Last fall, I talked with my brother about David Hockney's photo collages and how (a long, long time ago) we had experimented with this t...

The Schneider Curtagon 35mm f/4 seems to be a pretty rare lens. Web searches don't come up with much (any?) information. Everything I wa...