
Originally Posted by
jut703
These action cams don't have IS (not even the GoPro) because their extremely short focal lengths (SJ4000's is only 3mm) naturally avoid shakiness and blur. Such a small focal length also negates the need for autofocus, since that wide of a field of view (170 degrees) means that everything is in focus all the time.
The omission of fancy tech is the reason why action cams come in such small bodies.