In my previous cameras you could always you could feel a vibration during sensor cleaning. On my d3100 there is no vibration or none I can feel is this normal or if my camera defective
#1. "RE: sensor cleaning" | In response to Reply # 0MEMcD Nikonian since 24th Dec 2007Mon 21-May-12 01:11 PM
Welcome to Nikonians!
What camera bodies have you used in the past?
I have never felt my D300, D700, or D3s vibrate when I cleaned the sensor. I will bet that your D3100 is working normally.
Good Luck and Enjoy your Nikons!
#2. "RE: sensor cleaning" | In response to Reply # 1artr1955 Registered since 21st May 2012Mon 21-May-12 06:16 PM
Previous camera was Olympus e510. Other cameras are canon f1 and a vintage speed graphic. I still use film cameras and have a fully functional dark room. My father introduced me to photography fifty years ago. I still have all his large format cameras and use them often. My nineteen year old just received a Ain his photography elective and tells me if I ever say rules of thirds again he'll scream