Construction: Flashback Effect

To create a flashback effect in certain parts of the video I used a preset on the colour correction effect tab.

This is how I did it:

First I clicked on Event FX on the clip I wanted to create a flashback effect for.

Next I clicked on the effect "Sony Soft Contrast"

 Then I chose the preset "warm vignette"

 This is a shot before and after I added the soft contrast effect to it.

Here is a preview of the flashback effect in my video: