One final thing. If you're going to the extent of using the MUP, you should use either a remote release or timer release so you don't move the camera on the tripod with the shutter curtain open. Pushing the release button on the camera might move the camera slightly while the shutter open and defeat the whole purpose of mirror up.
I either use the Nikon ML-L3 or a 2-second time delay to release the shutter when I'm taking long exposure shots.
"Red is gray and yellow white, but we decide which is right ....and which is an illusion"