I don't get to shoot very often but I did get to shoot five model homes yesterday. They just didn't seem to be coming out clear enough in the LCD. I started testing and found that the Tokina 11-16mm which I use to shoot indoor pictures, wasn't auto-focusing. I tried to manual focus but my eyes aren't as sharp as they once were and the normal lens just doesn't hack it for many indoor situations.
Most of the shots were too far out of focus to be usable. Today I did some testing and found the my D3100 doesn't recognize the Tokina as having auto-focus capability. When I called Adorama, they said 'over 30 days' call THK Photo Products in California at 800-421-1141. Peachy. I called and got a recorded message that there was a text message available for this phone number and for just $9 a month and I too, could find out what the message said. There were no other options.
I went to their web site where they said, in short, send us your lens and we will let you know what it will cost but you might not see your lens again for a couple of months.
I need to look for other options but at the moment I'm 'bummed out'!