I'm trying to wrap my head around this. I've got a simple scene with some falling cubes which I'd like to render in cycles. When I activate motion-blur, it renders with motion-blur without a problem. However, I'd like some nice DoF in there as well. As soon as I turn that on. DoF renders, but motion-blur is gone. I know there are tricks to do it all in comp, although imho, there's not a proper solution to really nail motion-blur and DoF in comp. (motionvectors can't have dof and z-depth can't have motionblur..) Is cycles capable of rendering motionblur and dof at the same time in 2.8?