Eight days on the Altiplano without seeing another soul. Then we reached San Pedro de Atacama — and I couldn't wait to leave again. A sun-faded poster on an adobe wall sent us to Piedras Rojas.

In addition to lots of positive feedback (thank you all for your comments!) my image "A Desert's Sky" has also raised lots of questions all around the web. How did you do it? Which settings did you use? What equipment? Here's a little…