Background Blur on parallax background mobile game? Depth of Field seems not to work?

Thanks so much for the response! So , do I just replace my camera component with a cine camera? I did try this but the 32 blur seemed not to be enough with my current camera set up (far spring arm with high zoom)- do I have to do something specific to get the blur with this set up? (Thanks for your help!):heart_hands::heart: