Bronica's S2A is the most robust of the refined, gorgeous, and innovative cameras with the Bronica S mount. The S2A includes improved mechanical strength and adds a removable film back that the C bodies lack. The S2 and C2 series add a removable focusing helical that the S and earlier models also lacked. The S2A is the most capable of the early, pre-electronic Bronica cameras. Their build quality, mechanical precision, and lenses hold up today as equal to, or often better than, much later equivalents.