I’ve bought a secondhand Nikon 70-300mm f/4-5.6G for my D5100 but it won’t autofocus. Which bodies work with this lens? Niall Boyle, via email
Jason says… Nikon ‘AF’ rather than ‘AF-S’ lenses don’t have built-in autofocus motors. Instead, they rely on a motor built into the camera body to drive the autofocus mechanism, via a screw in the lens mount. All FX (full-frame) Nikon DSLRs feature a built-in AF motor, as do higher-end DX (APS-C format) DSLRs. Historically, these include the D70, D90, and all D7XXX cameras.
Bodies that don’t have a built-in AF motor include the D40, D40x, D60 and all cameras in both the D3XXX and D5XXX series. Unless you’re planning on buying additional lenses that rely on camera-driven AF, you’re better off reselling your secondhand 70-300mm lens and upgrading to the brilliant 70-300mm VR (£430/$500), discussed in the previous Q&A, which also includes the bonus of Vibration Reduction.