#1. "RE: D5100 & 70-300 VR" | In response to Reply # 0
I am thinking that there has to be an issue with the lens. AFS lenses should work on the D5100 without issue.
Nikkor AF-S DX 35mm f1.8/G
Sigma 18-250mm f3.5-6.3 DC Macro OS
#2. "RE: D5100 & 70-300 VR" | In response to Reply # 0
There are three versions of the Nikon 70-300mm. The AF-S version, which also has VR, will autofocus on both the D40 and D5100.
If he is having problems, then the camera and/or lens needs to be repaired if cleaning the electrical contacts does not solve the problem.
Seattle, WA, USA
D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II,
50mm f/1.4 D, 70-300mm f/4.5-5.6 VR, 18-70mm f/3.5-4.5 DX
#3. "RE: D5100 & 70-300 VR" | In response to Reply # 0
The D5100 fully supports the 70-300mm f/4.5-5.6G ED IF AF-S VR including AF.
Do they have the AF/MF switch on the 70-300mm set to AF?
Is the lens fully seated and locked in the mount?
Is the camera displaying an err message FEE or F--?