(User’s Manual pages 208 and 209)
If the high-frequency vibration method of cleaning your D5000’s sensor does not dislodge some stickier-than-normal dust, you may have to clean your sensor more aggressively.
In many cases all that’s needed is a dust blower to remove the dust with a puff of air. I remember having to do this with my Nikon D100 in 2002, and I was always afraid I might ruin the shutter if I did it incorrectly. With the D100, I had to hold the shutter open in bulb mode with one hand while I blew off the sensor with the other.
The D5000 helps out by providing this Lock mirror up for cleaning mode so that you can more safely blow a stubborn piece of dust off the low-pass filter. Using this function, it is much ...