I agree about the great background, however, to my eye it looks like the background is more in focus than the actual instrument. The instrument actually looks a little out of focus. My suggestion would be to put the spot you focus on at the rear of what you want to be in focus, since everything in front of that (up to the DOF cut off) will be in focus. Meaning focus on the rear of the instrument and not the front of it, then the whole instrument should theoretically be in focus.