You're describing curtain string bounce. The first curtain is slamming to a
stop (instead of being gradually braked to a stop), then bouncing back
slightly. In some situations the curtain string then loops up into the focal
aperture casting a shadow on the image.
The first curtain brakes need to be tightened, and possibly the brake spring
bent tighter as well. Not a do-it-yourself proposition, sorry to say -- if
the brake spring slips off the eccentric, a relatively easy repair suddenly
becomes quite difficult.
jason.gidden@xxxxxxxxxxxxxx wrote:
> The thread appears semicircular, centre-top, is about an inch to an
> inch-and-a-half long and encroaches down about half an inch down from the
> top.
>
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