All models of the Mamiya C330 TLR have dual releases, including one near the base of the camera that works "front to back". If I cradle the camer in the palm of my left hand, my index finger falls naturally there - and there is no twisting of the body when you work that way.

The Mamiya TLRs are also some of the easiest to use cameras for left-handed people like me (I have limited strength and dexterity in my right hand).