Here’s a great review of perhaps the best selling SLR camera in the last century that maybe you never heard about?  Definitely worth a read. These days these cameras are really inexpensive on Ebay and you even can get more modern versions with motor drive for about $140 with a f/2.0 lens

Kosmo Foto review of the Soviet Zenit-E SLR camera, one of the cheapest M42-mount SLRs available.

Source: Zenit-E review – Kosmo Foto