What difference does OIS make: Samsung Galaxy S6 vs HTC One M9

There is one notable exception, though: the HTC One M9. So we were curious to see what difference the presence of optical stabilization makes and took the One M9 for a spin, comparing it against the Samsung Galaxy S6, the current Samsung flagship. The 20-megapixel main camera on the HTC One M9 is the one with no OIS, while the 16-megapixel shooter on the Galaxy S6 does feature optical stabilization.
Miniature corrections happening hundreds of times make a huge difference
Keep in mind that optical image stabilization is a physical mechanism that is built in the camera module allowing the whole module to 'float', counter-acting movements on various axes: yaw, raw, and pitch. This mechanism will make hundreds of miniature corrections, and this results in the footage looking more stable, but you can also notice a slight wobbliness around the edges of the recording.
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