Here is a lens I just bought with the compur electronic shutter.
When it fires correctly speeds (the long ones at least which I can easily measure) work fine. But it fires erratically. Sometimes it does fire properly and the shutter stays open for as long as I have set it to sometimes it just reverts to the default 1/125 speed.
See this video I shot. It is set at 4 seconds. When I fire it doesn't obviously stay open for four seconds. If I try a second or third time it will fire correctly sometime. But the behaviour seems erratic. I haven't noticed a pattern on when it fails to fire correctly and when it succeeds.
Do you have any experience?
https://www.youtube.com/watch?v=McJ9...ature=youtu.be
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