I found an interesting Japanese site describing lots of Russian cameras , and others.. Thei came from Takasaki Clinic of Gastroenterology and Internal Medicine, what is a very interesting thing Once its main Doctor is also an expert camera repairer. there are lots of cameras with comparisons and great aknoledgement .
See All of them If you do not know Japanese, the pictures will be very agreable

It's a pity, but the links appear as expired...