Why is pr virtual focus after anti-shake?

Considering the pixel problem, part of the reason is that the device is unstable, so it will be defocused.

Although pr has the function of image stabilizer, if the original video itself has serious virtual focus problem, even if the image stabilizer function is turned on, it is impossible to completely virtual focus.

Virtual focus is in photography. Virtual focus means that the photographic picture has no focus. A little bit down, the whole picture is not clear, which is often said that the lens is blurred, that is, virtual focus, which is technically equivalent to a piece of scrap iron.