I’ve been given a Nikon DX lens that’s about 10 years old. It’s great when it works, but I of­ten get an er­ror mes­sage say­ing that the lens is not at­tached to the cam­era. What’s go­ing on? Brian Cur­tis, via email

NPhoto - - Niko Pedia -

Ja­son says... An in­ter­mit­tent elec­tronic con­nec­tion be­tween the cam­era body and the lens usu­ally causes this. Visu­ally in­spect the con­tacts on the cam­era and the lens, to check that they’re clean and shiny, with­out any build-up of muck. If they’re dirty, wipe them with a clean, lint-free cloth.

For con­tacts that are heav­ily soiled, try us­ing a can of elec­tronic con­tact cleaner, which costs about £5/$8. They’re usu­ally sup­plied as aerosol cans, so it’s im­por­tant to spray the so­lu­tion only onto a clean cloth, away from the cam­era, and never di­rectly onto the lens or into the cam­era body. If the prob­lem per­sists, there’s likely to be a more se­ri­ous fault with the lens that will re­quire pro­fes­sional re­pair. The elec­tronic con­tacts on lenses should be clean and shiny, with­out any build-up of grime that can cause a bad con­nec­tion

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