Zenza bronica etrs film back etr instruction manual. Available to purchase for immediate download. Below is an extract from the manual converted to text for a quick impression on the content. Zenza bronica etrs film back etr instruction manual1. Use film backs for shooting alternately with different types of film or color film inter- changeably with black- and-white or daylight color film with tung- sten type color film. 2. Use film backs for shooting continuously while the mood is good, with practically no in- terruption, by keeping preloaded spare film backs on hand.3. Keep a sufficient quantity of film backs on hand and a single Bronica ETR can be used by many, at home or even in the same studio.