Optical Image Stabilization (OIS)
Now a days smart phone cameras getting better day by day as they gaining more and more technical implementations. One such example is Optical Image Stabilization (OIS). Optical Image Stabilization has been around commercially since the mid- 90s when it started being used in compact cameras and SLR lenses as a method of letting photographer shoot longer exposures without reaching for tripod.
It is a very important feature on the cameras and some high-end Smartphone’s also offer this feature on their cameras because its promises to less blurry image and smother video. Here we will look at what OIS exactly does, how it works, and whether this feature really needed in your smartphone.
What it actually does?
OIS is very useful feature when a lens is zoomed out to its maximum magnification, it becomes extremely sensitive to even the slightest motion. It doesn’t prevent the motion blur caused by moving subject because it’s only able to reduce blur due to small shaking of a lens when held on hand when the cameras or phones placed in a tripod don’t need OIS.
Optical Image Stabilization works by small movement of camera lens element during exposure to counteract camera shake there by reducing blur. In general terms this is achieved by the use of a lens, gyroscopes and small motors. The lens module is generally moved sideways or up and down, to counteract the shaking of camera or phone, normally using electromagnet motors. The lens of the camera moved opposite direction of the movement of camera or phone that is if the phone is being moved to the right the lens is moved left. OIS system uses two gyros in the lens that detect both angle (sideways & up down) and speed of the movement.
After 20 years later, OIS has now became a mainstay feature of flagship smartphones. It’s a very good thing because image sensors used in smartphones are very small, and they can struggle to get enough light in some condition. Smartphone photographer’s use their OIS devices to get some blur-free shot. Now a days every flagship phone like S8/S8+, Note 8, Iphone 6s and many more devices offer this technology.