Hello all! I just replaced the seals on a Canon QL17. This is the smaller model with the 40mm f1.7, but with the plain QL17 nameplate before they updated to GIII. I also cleaned the rangefinder, and wow what a difference that makes! It's like 2x as bright as any other viewfinder ive seen. OK, so here is my question.. I was planning to just use a silver-oxide 1.5v battery but I was reading about the MR-9 adapter. It reduces the voltage from 1.5v to 1.35. But does it actually have a voltage regulator circut to keep the voltage steady or does it just have a resistor that flatly reduces the voltage?