Pluto Trigger - Manual (Page 17)

your Pluto Trigger cannot afford to sleep between Time-Lapse sequences,
and thus requires a source of external power for long Time-Lapse sessions.
4.2.2 B
ULB
-
RAMPING
T
IME
-L
APSE
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, which is also known as Holy-Grail in Time-Lapse. It works by
gradually changing camera Bulb exposure, achieving a nearly flicker-free
exposure transition from bright to dark, or dark to bright. This section
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.
Usage
Bulb-ramping Time-Lapse may greatly benefit from some preparation work.
Before you taking the Time-Lapse, you’d better get exposure metering of a
scene at a time of day when you bulb-ramping is planned to be finished.
For example, if you plan to shoot a sunset Time-Lapse, get an exposure of
the same scene the night before. Set your camera ISO setting to a fixed
value, remember the final exposure time, aperture and ISO values used.
Use the following workflow to prepare for bulb-ramping time-lapse:
1. Navigate to the “Solar Calculator” screen from app’s Menu. Remember
the official sunset time (for sunset session) or civil sunrise time (for sunrise
session).
2. Set up a basic Time-Lapse sequence as described above; make sure the
duration will cover the whole sunset/sunrise period. Use interval of 10
seconds for general bulb-ramping. Higher interval values will result in