I have been given a Pentax S1a. Initially it had a problem with the shutter speeds slower than 1/30 where the second curtain would not close. A quick look under the bottom plate found the problem and after a slight re-bending of a piece which holds the second curtain open, the shutter now opens and closes on all speeds. The problem is that the speeds below 1/30 are all very fast and seem to be the same. I have not checked 1/30 and faster yet but they seem to get progressively faster when viewing a light source through the open back. My question is this: Do the speeds below 1/30 use a different mechanism which somehow is not engaging now? If that is the case and speeds from 1/30 to 1/500 (and perhaps the 'hidden' 1/1000) are o.k. then I will not try to repair the slower speeds and just use it from 1/30 upwards. I almost always use 1/125 hand held anyway. In all other respects, this camera is in excellent condition and it would be a shame not to use it. Steve.