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 faster time-lapse
videos. Lower interval values will result in slower time-lapse videos. Note that
too short of an interval may limit your exposure range.
3.
Make sure your camera ISO is not set to "Auto". Doing so may interfere with
bulb ramping.
4.
Disable Mirror Lock-Up mode on your camera. Pluto Trigger cannot ensure
correct exposure timing in Bulb Ramping mode with Mirror Lock-Up enabled.
5.
Disable automatic focusing on your camera, choose a fixed aperture and set
ISO to the same fixed value you used when measuring your end exposure as
described above. If you did not pre-meter your end exposure, use any ISO
setting such as 200. Do NOT use automatic ISO feature, if available in your
camera.
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