amehta wrote:
If it didn't work on the D50, it probably won't on the D3x00. The D90 an D7100 have a focus motor, the D50/D3x00 do not. Can you give us the exact specs on the 70-300mm nameplate? Specifically, does it say "AF" or "AF-S"? The AF-S is needed for the entry-level DSLRs.
The D50 DOES have an AF drive motor in the body, the D40 and D60, as well as all D3XXX and D5XXX bodies do not have it. The Nikon AF 70-300mm will not AF on any of these bodies but will on the D50 and D90. Must be another issue with the D50.