When I tried to access the Lock Up Mirror For Cleaning entry from the D800E Setup Menu, I found it was grayed-out (the Image Dust Off ref photo entry was also grayed-out.) I called Nikon and this is what they told me: In order to access these two entries in the Setup Menu, you first have to go to the Shooting Menu > Shooting Menu Bank and choose "D". Then you must go to the Custom Settings Menu > Custom settings bank and choose "D". Once you are in the "D" banks - for both of these menus - then go to the Setup Menu and the Lock UP Mirror For Cleaning and the Image Dust Off ref photo entries will be available. The explanation from Nikon was that the "D" menus contain Nikon specifications and the camera must be in these banks in order for it to access these features. When I fooled around with the banks a little more I found that you only have to change the Custom settings bank to "D", no matter what shooting menu bank you're in. The above information is not in the D800 manual, nor does it appear in any of the several books I've read on the D800/E. It is also counter intuitive. The Nikon rep I spoke with said that they have received several calls similar to mine and will address this problem soon.