I use a Nikon D3100 and I take portraits of teens. I recently invested in a AF Nikkor 50mm 1:1.8D lens but the auto-focus doesn't work. I didn't mind practicing with the manual focus but when I take portraits with that lens, sometimes they come out a little blurry. I wanted to try and use auto-focus again and had someone suggest to me that I buy a AF-S DX Nikkor 35mm 1/1.8G lens… It came in the mail today and I like how the pictures come out, but… Still no auto-focus. I have looked up both manuals, and I seem to be missing something!
Read more: How can I get auto-focus to work?