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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
It looks like by default, that camera fine-tunes the focus (even in manual focus).
From the Canon support page: To deactivate automatic focus fine-tuning when the shutter button is pressed halfway, choose -> [ 
] tab -> [Safety MF] ->[Off].
The workaround I used with a camera that had similar "functionality" was to use a sheet of paper with a grid on it (that I could easily remove in post) and this gave the camera enough to focus on.
