The slider is very responsive and video zooming is immediate with no lag at all. What you see is exactly what you get as the final output. Supports ONE TOUCH AUTO ZOOM : tap the + button to start auto zoom in tap the - button to start auto zoom out Use Gridlines options, to perfectly align your videos. ---------------- NOTE : Zoom Recorder cannot be used with existing videos. It can only be used to take new video. ---------------- Now you can bring your favorite objects closer in your video with clarity - Close and Clear. Please rate this app and share with your friends if you like it. If you have any suggestions, please contact us.