How to clean NIKKOR lens CPU contacts

NIKKOR D, E and G type lenses have Central Processor Unit (CPU) contact pins located near the lens bayonet. When a lens is attached to a camera, the pins make contact with electronic contacts inside the camera body. This contact allows power and data to flow between the camera body and the lens.

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CPU contacts near the lens bayonet.

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CPU contacts located inside the mirror box of a DSLR camera

If an error message 'F--' is displayed on the Control Panel LCD, this can indicate a communication problem between the lens and the camera body. This can occur for a number of reasons and occasionally when the CPU contacts get dirty due to general use.

We recommend cleaning the CPU contacts on both the lens and camera body with a photographic cleaning tissue wrapped on a small wooden stick (such as a chopstick). A general cleaning fluid such as a surgical spirit is recommended. Wipe the cleaning tissue slowly across the contacts a few times until they look clean. The contacts should be free of dust or dirt.

Avoid dusty environments during cleaning. Re-attach the lens after cleaning or use lens/body caps to reduce dust.

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