Some of my Bronica backs for my Bronica ETR-Si camera skip frames certain times, or there is sometimes an overlapping exposure. I've heard this is a common problem that develops with these backs. Any way to fix this ?
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Hello. 35mm cameras back in the day used to suffer from this irritating problem. There is a small button that is pressed by the door edge when you close the back. Due to age(flexing and slop) that occurs with normal wear, the metal edge becomes ever-so-slightly bent, resulting in a less-than-needed pressure on this button. The button, when held properly by the back, captures a little internal gear mounted on the film counter dial--preventing its spring-loaded return. When you remove the back to re-load film, the counter immediately jumps back to "start". As the film advances, the roll increases in size and pressure against the door, causing the symptom. Go to a camera store with knowledgeable sales people and you might find one who knows how to re-work the back just-so to fix it. To be absolutely sure, however, you'll need to buy another back. On some medium-format cams, there is a little raised "bump" on the edge of the door that precisely matches up to the position of the button. If this is the case, and you are careful, it can be gently but firmly squeezed to make it stick out more, increasing the pressure on the counter button.---Rick
All ETR backs work with all ETR cameras except the ETR-C, which only uses the inserts. The early backs have a single latch and a winding key. The middle ones have double latches and a winding thumb wheel. The Ei backs have double latches and a winding crank like a 35mm has. The Ei backs also have a locking dark slide to prevent accidental film exposure wnen the back is off the camera. All inserts work with all the back frames. I the used market you will find them in any combination (frame, insert & darkslide).
I am aware of three series of lenses: MC, EII and PE. They all work fine with any body.
Since I never use a TTL flash with my Bronica's, I'll give you my suggestion for a great solution. Using your TTL Metz flash, (make sure you've connected the TTL cord for Bronica ETRsi) take 8 shots at different apertures on A (Automatic), then take 8 shots at different apertures on M (Manual). I realize this will waste one 120 roll of film, but one negative will stand out as your perfect exposure. Yes, whenever you reduce the ISO in half, your basically overexposing the film by one f/stop. Just remember that this overexposes everything your shooting from foreground to background. With flash, this may cause your highlights to wash out, but any good lab could print for the highlights and make the background go darker. I used to shoot Vericolor at ISO 125 instead of it's rated ISO of 160.