There was never any fix for the 2S battery drain issue (aside from a lowering of it when used with T flashes, and that required installation of a tiny sub-circuit). Just as the 2S was being accepted by dealers and the public, it was discontinued. Olympus never upgraded the board. :bang: For longest battery life, use silver oxide batteries only (357, SR44W, G13, MS76, KS76) and make sure bottom cover screws are tight. There were 5 different 50mm 1.8s made. The best performer seems to be the last multicoated version which has "made in Japan" on the name ring (not just "Japan"). Of the 50mm f1.4, look for multicoated version above 1,100,000 serial number. John