The new Sony NX5U does not do overcranking or undercranking. The smooth slow-motion is for very short (3, 6, or 12 second) slow motion recording with stabilization applied. There will be an image quality drop when using this function. Sony recommends using it for golf swings. So if you are looking to shoot sunsets, this camera will not do the undercrank like an EX 1 or 3. Nor will the NX5U do the overcrank for slowing down bicyclists like the EXs.