Now that I have a new d7100, I want to slowly add some good glass to use with it. I did get the Nikkor 35mm f/1.8 because it has a great rep and it is cheap. I have an all purpose zoom lens but I feel the need to have better lenses when I am doing something other than shooting family event photos (ie. birthdays, Christmas, etc). I see lots of posts on using older lenses on this camera because it has an internal motor. I tried to do a search on Google and came away more confused. I don't want to buy a lens on Amazon that doesn't work on my camera. Any help on this matter would be greatly appreciated. Any favorite older lenses to recommend would be great also. Currently I have the Nikkor 35mm f/1.8, a Tamron 18-270mm , and a Tamron 60 mm Macro lens which is nice for portraits and bugs. I am starting to become a Nikon snob so I want more Nikkor lenses. and Yes I have serious GAS!!