[jbaker]

Got a mark on my pictures and want to clean the sensor with a rocket blower.
According to the manual I need to select Mirror Lock Up from the set-up menu.
But this option isn't appearing in the set-up menu.
Am I missing something?
Battery is fully charged.
Any ideas?
Thanks

[Yandros]

Try scrolling down. I think the lockup is off the bottom of the page (see linky below).

http://www.dpreview.com/reviews/NikonD40/page11.asp

Also blow on the rear element of your lens, a dust bunny there will actually be more visible than on the sensor. Don't be too suprised or worried if you blow dust or other junk up into the focussing screen. I think my resident population of dustballs just moves around between sensor, screen, mirror and lens, just to torment me!

[Liquid101]

I'm not sure about the D40, but the D50 needs to have the CSM/Menu Setup on 'Detailed', rather than 'Simple' to use this function.

[Johnmel]

Press the menu button, select the setup menu(the spanner) press ok and then scroll down, mirror lockup is 4th option from the bottom then press ok again.

[jbaker]

Thanks for that. I needed to change the Menu/Set-up from Simple to Full for it to show.