It was a couple of years ago, when I saw some excellent examples of daguerrotype photographs in a periodical publication. Contemporary portraits of cowboys, but made on tintypes.
The problem is that I forgot the name of this magazine, but I think there must have been a word "lens" in it's name.
I want to help a little bit my friend in Germany, who is studying art history and now is about to write semestral work on old photographic techniques.