Rollei flex Mode D'emploi page 25

EV +/-
25
EV+ EV-
There may be times when you wish to over- or underexpose the photo
for a desired effect. You can achieve this by changing the shutter
speed or by using a full stop with the EV switch.
A / B modes
A is for AUTO. B is for slow shutter. The slow shutter keeps the shutter
open for max 10 seconds to create mesmerizing night shots or light
painting. Slow shutter overrides the electric eye and EV.
Shoot with B mode –
slow shutter