Epimetheus
Well-known
I have been testing out a Noctilux on M8 and it sure has been dark enough for that:
http://markuspuustinen.com/galleriat/10/pictures_with_leica_m8_and_noctilux/
http://markuspuustinen.com/galleriat/10/pictures_with_leica_m8_and_noctilux/