Mark Elson is an LA-based photographer who was doing a series on American Civil War re-enactors and decided to use the contemporary wet plate collodion photography:

I learned the process, had equipment built, and found period lenses. I fell in love with this demanding and beautiful process, with its rich tones, great detail and timeless look.

Fascinating results and in a book Battlefields of Honor which appears to be available in the US and UK.