If you ride the special express train 126 miles northwest from Tokyo, you'll find yourself in Nagano Prefecture near beautiful, blue Lake Suwa, noted for its hot springs, spas, large swan- and turtle-shaped tour boats, and one of the highest geysers in the world. The lake is recovering nicely from industrial pollution. When I first visited years ago, much of the blue was green algae, thanks to many manufacturing plants, including photographic ones, pouring effluences into the lake.
I enjoyed overnight stays at a tiny Japanese ryokan (inn), with open raised daises surrounding a small pool in which carp swam lazily until summoned to be dinner. In the evening, engineers from the nearby Yashica, Cosina, Chinon or Olympus manufacturing plants dropped by for carp sashimi (and horse sashimi, for which the region is also known), and to watch Japanese baseball on TV. There would be plenty of time to discuss cameras and lenses the next day at the factories.