No matter which camera apps I used (Camera+, Manual, ProCam, etc.) I can't get the camera to take photos with higher ISO than 500 and shutter speed slower than 1/4s.
For example, I set the ISO to the max, which is all different from app to app which is weird, and the shutter speed to the slowest settting, 1/2 of a second, the screen shows a bright and nicely exposed preview, but the the taken photo show up darker and the EXIF data shows a different values for the shutter speed and ISO.
This page has a better explanation: http://tool-box.info/blog/archives/1580-Low-light-photo-on-iPhone-6-Plus-is-broken.html
For example, I set the ISO to the max, which is all different from app to app which is weird, and the shutter speed to the slowest settting, 1/2 of a second, the screen shows a bright and nicely exposed preview, but the the taken photo show up darker and the EXIF data shows a different values for the shutter speed and ISO.
This page has a better explanation: http://tool-box.info/blog/archives/1580-Low-light-photo-on-iPhone-6-Plus-is-broken.html