User's Manual

26 Promote Control 3.15 User Manual Rev 23
© 2014 P romote Systems
Assistant Cable connection. It may not be fully inserted into the Promote Control sensor port.
7.5 Bulb Ramping
The Bulb Ramping mode is intended for Time-Lapse users who would like to take Time-Lapse videos in
changing light conditions, such as a sunset or a sunrise. It works by varying camera Bulb exposure in
very small increments, achieving a nearly flicker-free exposure transition from bright to dark, or dark to
bright. This material assumes familiarity with basic Time-Lapse concepts.
A bulb ramping sequence consists of taking a set of pictures with constant exposure, then changing
exposure in very small increments or decrements for a certain period of time, and then taking another
set of pictures with constant exposure. The resulting exposure set can be visualized by the following
curve:
The exposure can be increased (as in above example) if your light levels will drop (as with a sunset), or
decreased if your light levels will rise (as with a sunrise).
Settings
The following settings are available:
Start 1/20 ea 10s
Begin Ramp in 01h00m
End 2” in 01h30m
Finish Seq in 02h00m
The above screen would result in a bulb ramping sequence that starts with a 1/20 second exposures
taken every 10 seconds. This continues for 1 hour. After that time Promote Control starts slowly ramping