Let’s face it, there really isn’t a camera on a smartphone that can handle low light as well as most of us would like. Some times the images are too dark, other times they’re too low grainy. And in some cases, there’s even focus stuttering. This unfortunately plagues some Samsung Galaxy S II units. Thankfully, not all cameras are affected—just devices with the CDEF02 camera module. Now, there’s a way to mostly fix it.
XDA Forum Member KINGTATu noticed that when lowering the camera’s ISO setting, the issue went away. As KINGTATu explains:
n iso 100 and 200 u would Never have Low-Light Stuttering and its not dark while recording its just a bit draker even less than setting exposure from 0 to -1
Naturally, lowering ISO makes taking low light pictures a bit more difficult, as you need to have a steadier hand. However, if your main concern is the focus stuttering, this could help.