Sorry to deviate off topic for just a moment here, but SafetyBob, why are you even trying to shoot playing kids with manual focus cameras anyway??? Clearly there are better tools for that task. Your 50% success rate makes that obvious enough. Add composition, timing and lighting issues onto that and you must get very few pleasing results. And yet you continue to throw away 50% of your film after paying for it and processing it. What could possibly be motivating you to do this? Do you ever use AF cameras?