Pluto Trigger - Manual (Page 19)

14. Press the "Start" button to start. The image sequence will begin
immediately.
NOTE : In many circumstances your start exposure will be shorter than what
Pluto Trigger allows you to choose. This case would require installing ND
filters in front of your camera lens to make exposures longer than 1/20
second.
4.3 HDR
High dynamic range imaging (HDR) is a process in which a greater
dynamic range of light is captured throughout the lightest and darkest
areas of an image. HDR Photographs are generally created by shooting
multiple photographs using exposure bracketing. After that, they are
merged back together into a single HDR image.
With Pluto Trigger, you can shoot up to 19 photos in a HDR sequence. And
the exposure step can be set a value from 1/3 to 3 stops.
Due to using Bulb mode, the shortest exposure that can be used in HDR is
limited depending on your camera model. In addition to that, exposure
close to the shortest limit may be slightly less accurate and may vary in
brightness.
Usage
1. Connect Pluto Trigger to your camera with camera release cable.
2. Turn on Pluto Trigger and make sure Bluetooth is turned on.
3. Turn on your camera. Set your camera to Bulb exposure mode.
4. If your memory card allows, set your camera to RAW image format. This
will make post-processing much easier. If you change image quality
setting, re-check that your camera can still fit the planned number of
images.