What if Sony hx30 achieves 20x zoom?

You just need to think about the geometric principle to know this. The longer the focal length, the more your camera moves, which will bring great changes. After all, your hand is not a fixed clip, and there will always be some jitter, so it will be enlarged obviously when the focal length is long. Sony HX30 telephoto is 20 times, even if the equivalent focal length is as large as wide angle 18mm, the equivalent focal length of 20 times telephoto is 360 mm.

There is a theorem in photography: "In general, the shutter speed should be at least equal to your focal length." What do you mean? That is to say, if the focal length is 300mm, it will take at least 300 seconds for your shutter speed to overcome the jitter and eliminate the blur caused by the jitter.

Therefore, the only way is to shoot with a tripod or put the camera on other objects.