I have been having problems with the 360mm f5.6 Schneider Symmar-S on bulb setting in a Compur #3 shutter: When I release the locked cable release, the shutter stays open and I would have to close it manually. This happens on the B setting only and all speeds sound correct and the exposures are accurate. Yesterday I was debating whether to send the lens in for CLA and today, for the first time, I decided to “exercise” all the LF lens by working the shutters a few times. When I got to the 360 everything seemed fine so I installed a cable release and ran through the shutter speeds. Everything worked fine until I got to the B setting and as usual the shutter would open but wouldn't close when I released the lock on the cable release. Then, for some unknown reason, I took the lock off the cable release and the shutter closed each time that I released the plunger. In other words, the shutter remains open when the cable locking devise is used but closes when it isn't used and the plunger is released. Is this the norm for the Compur #3 shutter or is it due to the cable release? The Compur requires a "long throw" release and the 2 that I have are both the same Japanese made cloth covered release that can be found in well-stocked stores.
Thomas
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