I am at around 4000 shutter clicks right now and images taken at f16 using my 50mm Nikon lens were full of probably 40 small dust spots.The spots were not nearly as visible with my Tokina 17-35mm lens.
|50mm at f16. Image enhanced to show the spots|
Below is a sample image after cleaning.
|50mm lens at f16 AFTER cleaning. Image enhanced|
|50mm at f8 AFTER cleaning. Image enhanced|
I have been shooting for over a week since I cleaned the sensor myself and so far I haven't seen a single spot. This has probably been the first time since sending the camera back to Nikon that I have been dust free.
Image 4500 taken today:
Cleaning was done with a Sensor Swab kit: