Fluorescent Mineral Society - Techniques for photographing specimens under ultraviolet light. Selection of lighting,.filters, film and backgrounds. Calculating exposure times, and avoiding reciprocity failure.
It is an Exa made by Ihagee, who also made Exakta cameras. There are over 25 models of Exa cameras. The USSR Occupied indicates the time period that it was made. Go to eBay.com and search for Exa and you will be able to see some Exa cameras. Here are...