I am trying to take video for a time lapse of stuff I write on white paper. Issue is that when the paper is blank, it looses its focus automatically. Unitl something or some writing/drawing/object is put on the paper the focus will wander off.
All this happens even when my camera is in manual mode.
Here is a sample:
First I want to understand why it happens, and, how to avoid it. I own a canon powershot sx 520 hs