Lytro Illum User Manual page 41

Swipe the band from right to left to increase the shutter speed, or from left to right to lower it. Tap on any speed visible in the selec-
tion band to go directly to that speed. Double-tap on the selection band to the initial shutter speed setting.
Swipe the shutter speed selection band to increase or lower the speed.
Once the selection has been made, tap the screen anywhere outside of the selection band to close the band. A half press of the
shutter button will also close the selection band. A full press will close it and take a picture.
Set the shutter speed using the front dial while in Shutter Priority Mode or Manual Mode*. As the dial is rotated, the shutter speed-
EV compensation indicator in the Information Bar at the bottom of the screen will change to display the current setting.
*Note that the functions assigned to the front and rear dials in the various exposure modes can be changed (see Camera controls).
The default assignments are referenced here.
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