The Tenax was modified in 1953 with a fixed viewfinder integrated in a higher top plate with the exposure counter inside it, and a revised advance lever.
2.
This mechanism started the exposure counter automatically, auto-spaced the 12 or ( on the later model F cameras ) 24 exposures, and tensioned the shutter; all with less than one full turn of the film advance crank.
3.
The first series had a fan-shaped exposure counter window and a tripod socket attached by three screws, whereas the second series had a round exposure counter window, a tripod socket integrated in the bottom plate and a meter switch built in the advance lever.
4.
The first series had a fan-shaped exposure counter window and a tripod socket attached by three screws, whereas the second series had a round exposure counter window, a tripod socket integrated in the bottom plate and a meter switch built in the advance lever.
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