| Author | Message | ||
     Xwhatsit Tinkerer Username: Xwhatsit Post Number: 3 Registered: 02-2010 Rating: N/A |
Hello, Was a sunny day at the beach so took my new Yashica YF. After souping the shots, noticed that 1/1000 (which I've hardly used yet) was capping rather badly. The YF is a Nicca 5L facelift, which in turn was basically a fancy Leica-M style body with screwmount innards. As far as I am aware, it's a pretty typical Barnack shutter, with the slow speeds on the front etc. I read about shutter capping, and after doing the CRT shutter test I decided that the 2nd curtain did have too high a tension. Pulled off bottom cover, looks like somebody has been in there before. The YF has these interesting ratchet and pawl adjusters for shutter curtain tension. I backed some tension off (way too much, curtain wouldn't run the whole way), then tightened it up. It stopped capping, but the speeds were too slow. So I spent an hour or so fiddling around with the second curtain's tension. Here are the weird things that are happening now: Sometimes the shutter doesn't release properly on 1/1000; you press shutter release, first curtain is released part way (maybe the gap at 1/1000?) and the shutter won't continue. It'll usually carry on once you take your finger off the shutter release. Before I touched the 2nd curtain tension, it'd do this occasionally on 1/30 - 1s. This problem seems to be OK now with the current curtain tension I have it set to (which is slow). When I up the curtain tension slightly (I think), 1/1000 starts capping in a different way: instead of closing the gap towards the end of the shutter cycle (classic 2nd curtain too tight, right?), the "fade" is at the beginning of the cycle instead. Doesn't happen every time. Do these two things point to a problem with the shutter release mechanism instead of curtain tension? Or do I need to start adjusting the first curtain too? Last thing: right now I know the second curtain tension is too low. Shutter speeds look too "wide" on the CRT screen. This has affected (I assume this is the cause) the slow speeds: 1 second sounds more like 1.5 or 1.75s. Not too worried about that yet, until I get the fast speeds right. However B does an interesting thing; unless the slow speed dial is on 1/30, when you take your finger off the shutter release, it'll run through the 1 second escapement or whatever you have it set to before closing the curtain. I can't remember if it always did this! I don't think it's right though. I'm going to build a three-sensor shutter tester for my sound card during my lunch break today and that might give me a clearer picture (no CRTs at work either, ha). Focal plane shutters are a pain! I thought I was going to be in for a treat after fiddling with the microscopic springs and gears and levers in Compurs, but I wish I was dealing with a leaf shutter right now :P. Oh well, I suppose the frustration will pass when I understand what is going on. |