That is about the difference I see when I use a 10x binocular without the IS on and when I engage the IS, and I don't have Parkinson's. It is much worse at 12x and above. We probably differ in how steady we can hold binoculars. That is why some people can handhold 10x and above and some can't. Mr. Tripod above said he has no trouble holding 20x steady. I say good luck with that! Here is a video of a Canon 15x50 IS,12x36 IS III, Farvision 20x50 IS, and Canon IS with IS off and on. It looks similar to the first clip to me, although they are keeping the smartphone centered over the ocular better in these clips.The explanation is quite simple. When you properly hold a binocular, you have 3 points of contact - your hands and your face. When you have a smartphone attached to it, you simply cannot hold it as steady. The IS will still reduce the skaking but the view through the bino without IS is simply not realistic in any YouTube videos.
Not even considering the fact that our brain runs a powerful software to automatically reduce shaking. Otherwise our normal view of the world when moving would look like the infamous "shaky camera" in horror movies. Does your world hobble up and down when you're walking?
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