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<blockquote data-quote="WayneF" data-source="post: 488485" data-attributes="member: 12496">A big part of your problem is that the 30 second shutter speed is actually 32 seconds, and it will require a 33 second interval.&nbsp; The gaps are when it misses whole intervals because the shutter time is longer than the interval.&nbsp; Interval has to be longer than the shutter duration.&nbsp; I know you planned to do it right, but it's tricky.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />Each shutter stop is 2x the light.&nbsp; So it obviously has to run&nbsp; 1, 2, 4, 8, 16, 32 seconds.&nbsp;&nbsp; No other numbers that include 1 second will work.It is marked in nominal numbers easy for humans who don't know, don't care, but the camera does it precisely, and 30 seconds is 32 seconds.In the same way, 1/30 second is 1/32, and 1/2000 second is 1/2048 second.But we can time the 30 seconds.&nbsp; Time it yourself.&nbsp; Then use 33 second interval.Everyone makes the same mistake.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" /></blockquote>

[QUOTE="WayneF, post: 488485, member: 12496"] A big part of your problem is that the 30 second shutter speed is actually 32 seconds, and it will require a 33 second interval. The gaps are when it misses whole intervals because the shutter time is longer than the interval. Interval has to be longer than the shutter duration. I know you planned to do it right, but it's tricky. :) Each shutter stop is 2x the light. So it obviously has to run 1, 2, 4, 8, 16, 32 seconds. No other numbers that include 1 second will work. It is marked in nominal numbers easy for humans who don't know, don't care, but the camera does it precisely, and 30 seconds is 32 seconds. In the same way, 1/30 second is 1/32, and 1/2000 second is 1/2048 second. But we can time the 30 seconds. Time it yourself. Then use 33 second interval. Everyone makes the same mistake. :) [/QUOTE]

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