Choose ISO, Shutter Speed. 4. (Choose White Balance according to your preference) 5. Tap the shutter button. # About 5 modes Starry sky mode : Highlight bright stars, and increase contrast. Star trails mode : Lighten blend mode for star trails. Milky way mode : Increase contrast. Night view mode : No image processing. Lighten mode : Lighten blend mode. (for firefly, light trail, etc) ### If the app crash often on old iPhone, try to choose small resolution in the preferences view.