Quote - I googled fstop and did some reading. The smaller the number the less DOF there is. The larger the number (up to 22) the greater it is. To focus more on the orange robot and less on the red robot use the DoF guide (crosshairs). Put them on the orange robot and use a smaller fstop setting (1 to 3). This will focus the camera on the orange robot and blurr the red one.

Thanks for the info! :)