The number of images you capture to make up one second of animation is described as “frames per second” or “FPS”. The greater the number of images you capture per second the smoother your animation will appear when it is replayed. There is a limit obviously to how many frames you need to take per second. Thirty ( 30 ) frames per second ( fps ) is considered the absolute maximum required. In fact professional stop motion rarely uses more then 24 fps. Amateur stop motion can be very effective at achieving smooth stop motion at 15 frames per second. In other words taking fifteen images for one second of animation will give you acceptably smooth animation.
Shown here on video are some examples of animations done at a low frame rates and some others at higher frame rates. You can see the stark difference between the two of them. The 15 FPS is true stop motion animation whereas the first animation is barely animation. It could be seen more as a slide show.
5 FPS – Not how to make Smooth Stop Motion right?