I had this iPhone for one year but this is the first time I noticed this issue.
These are my specs: iPhone 5S 32GB – iOS 8.4 – ME435CS/A.
This is a photo made w/out flash:
This is a screenshot from a video:
Is this even a bug or I'm missing something?
Best Answer
While it may be true that the 5S has lower quality low-light video recording than other iPhones, there is a fundamental physics fact that you have to keep in mind: To get more light in a picture –controlling for other factors such as ISO and aperture– you need more time for each picture, more exposure.
I just did a test on my iPhone 6, and the "problem" persists.
The thing is, it is impossible for an image to look brighter with less exposure.
In the case of my pictures, the first picture is taken at 1/15 of a second, with an ISO of 500.
I can't find the ISO information on the video but I know the exposure: it has to be at the most 1/60 because I've setup video to have 60 frames per second. So it is 4 times faster -or 4 times less exposure- which explains the darkness.
Remember a video is just a series of pictures.
From the comments one of the links provided by Doc G.(emphasis mine):