Dual capture is automatically on. This means that Nokia Camera stores both the 5MP photos and the full-resolution photos. If you don’t want to save the full-resolution photos, you can switch dual capture off. In Nokia Camera, tap … and settings. To switch dual capture on or off, change the setting for Capture mode.
Note: This applies to Nokia Camera in the Nokia Lumia 1020, Lumia 1520 and Lumia Icon.