Old leaf shutters that run a stop off are normal. I clean shutters w/ lighter fluid or high proof alcohol or carb cleaner or whatever is needed not to make the speeds accurate, but to clean the blades mostly so they don't stick. You need to buy or build an inexpensive electronic shutter tester that runs on Audacity (free download) so you know at what speeds the shutter is really firing at, and write them down on a piece of paper when you go out. 1/60=1/25, 1/125=1/60, that sort of thing. I can usually leave the cheat sheet in my pocket, as the speeds are often one stop off consistently, at least above 1/60. This goes for focal plane shutters in SLRs. Old cameras have weakened shutters, and you need to compensate. Even the electronically timed shutters I test, and they tend to be off too. Beware of leaf shutters that exhibit bounce (two peaks on your Audacity histogram, or whatever it's called). I know of no way to fix that, as it's usually due to worn parts. Better to sell it and get another. Some of my old folders have had 1/500 only get to 1/175 or 1/200. I don't care, since when I know the REAL speed I set my light meter accordingly and just shoot away.
Last edited by momus; 09-29-2013 at 03:02 AM. Click to view previous post history.