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<blockquote data-quote="WayneF" data-source="post: 404438" data-attributes="member: 12496">I don't understand your situation.. you said timer set to 30 seconds, shutter on bulb, no interval.&nbsp; But there must have been some interval, I just don't understand its timing mode.I cannot see that this is applicable, except that your problem does match the classic symptoms.To photography, the concept of a 30 second shutter is that the shutter is necessarily actually 32 seconds.&nbsp; It has to be 32 seconds because of the concept of 2x stops,&nbsp; 1 second, 2, 4, 8, 16, 32.&nbsp; Time your 30 second shutter once, and it will be 32 seconds.&nbsp; This gives interval timers much trouble, because a 32 second shutter cannot work every 30 seconds.&nbsp; Try a 33 second interval for a so-called 30 second shutter.Whether this is your case or not, I am unable to know.&nbsp; But there had to be some interval, the timer must have been timing both?&nbsp;&nbsp; I just don't know any details.</blockquote>

[QUOTE="WayneF, post: 404438, member: 12496"] I don't understand your situation.. you said timer set to 30 seconds, shutter on bulb, no interval. But there must have been some interval, I just don't understand its timing mode. I cannot see that this is applicable, except that your problem does match the classic symptoms. To photography, the concept of a 30 second shutter is that the shutter is necessarily actually 32 seconds. It has to be 32 seconds because of the concept of 2x stops, 1 second, 2, 4, 8, 16, 32. Time your 30 second shutter once, and it will be 32 seconds. This gives interval timers much trouble, because a 32 second shutter cannot work every 30 seconds. Try a 33 second interval for a so-called 30 second shutter. Whether this is your case or not, I am unable to know. But there had to be some interval, the timer must have been timing both? I just don't know any details. [/QUOTE]

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