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If you want to do short exposures with mirror lockup it is just a matter of using the interval to give the system time to settle down after mirror lockup and then the exposure occurs at the start of the next cycle. So you get one exposure for two cycles.
This is great fo multiple exposures of Sun, Moon or Planets. I used this for the transit of Venus. It also gives you frames the same time apart for subsequent animation. As Leon says this timer is great. Itis also good for timelapse.
Bert
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