First let me thank you for the great job you are doing. For people like us who are new to Digital SLR, this is a great place to start with.
I have been using the D3100 for last 4-5 years. I have been using both manual and auto settings. I have just purchased your Cheat sheets for the Nikon D3100 and 18-55mm, hoping it will improve my manual settings.
I am wondering if you can suggest which lens should be my next upgrade on this camera?