A revision of the ETRS was made, that replace the body to a newer plastic shell. The specifications of the camera remain unchanged. The lens release design has changed from a circular style to a rectangular one, it has also changed location from the front of the body to the side. This redesign makes removing lenses easier, pulling on the switch and rotating the lens to release instead of rotating and pressing the lens release as well as rotating the lens. The roll film holders have been changed to a two release tab system.
Meer informatie:
https://www.cameraland.nl/tweedehands-bronica-zenza-etrs-met-zenzanon-mc-75mm-f-2-8-cm2555