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How to set up a Non-CPU lens on Nikon DSLR cameras using legacy NIKKOR lenses with the Nikon DSLR camera.
For Non-CPU lenses to communicate with some of the Nikon camera bodies.
For the camera, to meter the exposure, you’ll need to provide the camera with some lens data – lens focal length and maximum aperture.
This will allow You to gain access to a variety of Non-CPU lens functions.
The only exposure modes that will work with NON-CPU lenses are Aperture Priority (A) or Manual exposure (M) modes.
Nikon DSLR cameras will allow you to store lens data for up to nine non-CPU lenses.
First, attach the non-Ai lens to the camera, next go into the set-up menu and select Non-CPU lens data.
Choose a lens and enter the focal length and aperture.
It’s very easy using old manual focus lenses with the Nikon d3000 series and D5000 series camera. Put the lens on the camera and change all settings to (M) manual, and start shooting.
The camera needs to be in manual mode, nothing can be in auto mode, only the white balance can be on auto.
Here is a video from Matt Granger that explains how to set up a Non-CPU lens on the Nikon DSLR camera.