out of time in the ~40 minutes before this second event, you can hold off and record the dark field after the second event is completed. if you run out of time in the ~40 minutes before this second event, you can hold off and record the dark field after the second event is completed. if there is plenty of time remaining after you have acquired the new field, you can loosely cover the front end of the telescope (or the front end of the dew shield) with the telescope lens cover and record a 2 minute video with no light entering the scope. this video will be used to 