So Im in Saskatchewan at my friends go into her little local mom and pop store and guess what they have consignment lenses. Now Im not sure if these would be overlapping the range i have now or any of them are even a good deal so i thought I would ask you guys. Three that I looked at one was Nikkor 28- 70mm another was 35- I forget i think 105 or something. Another was a 135 prime and another was a Tamron 500mm Mirror lens. I have the 18 - 105mm DX and a 50mm 1.8. They ranged in price from 60dollars to 100. Are any of these decent for that price to play around with or are they basically going to give me the same as I have now. Im not familiar with the d90's crop factor etc. I think all of them were autofocus capable except one. Thanks for any info you can tell me. The guy at the store wasnt the camera expert he was an associate new and everyone else was gone for lunch. Thanks in advance.