Originally posted by stevebrot
As for Eric, he did the seals on my SV and I was pleased to see that the door seals were done with black twine rather than foam. That approach is so very old-school and indicative of the quality of his work.
I had the same reaction when I received my H3v and H1a back several months ago. Quite a bit more longevity than foam stripping I'd have to imagine as well.
When I do my own seals I cut foam simply because it's so cheap and easy, but the twisted black wool sure is more professional looking.
---------- Post added 10-07-18 at 11:10 AM ----------
Originally posted by Kim Coxon I suspect it is more a case of the mechanism rather than the shutter curtains themselves. It may be it is the curtains but if they fail usually the shutter is open all the time.
---------- Post added 10-07-18 at 05:37 AM ----------
If the shutter is not opening on B, it sounds would seem that the first curtain is not travelling. Open the back, cock the shutter and fire it. Then slowly cock the shutter again watching the curtains. You should see both curtains being wound. You should see the metal bar on the second curtain moving across. But as that passes across, you should be able to see the first curtain also moving. If it isn't then that is the problem. It is unlikely to have become detached if you can still see it but more likely to be jammed.
This was my first thought as well. My S1a suffered the same issue. The advance mechanism is likely partially jammed. This is accessible from the bottom plate - there was a thread that involved this issue back in spring that I can try to locate, but at the end of the day even if the OP frees the mechanism a CLA is still in order or it is just as likely to happen again shortly down the road. And that said, ALL of these S-series Pentax should see a CLA if you wish to shoot them regularly and reliably - they're all just too old at this point to rely on them if you don't know the service history specifically. My guess is this issue would easily be remedied by a proper service, which would also prevent it in the future.
---------- Post added 10-07-18 at 11:15 AM ----------
Here is the thread I mentioned. See the great video post by @ctrout midway down. A different issue at hand, but the advance mechanism is shown clearly.
SV jammed advance lever - PentaxForums.com