I’ve up­dated my D5300’s firmware and now my Sigma lenses won’t aut­o­fo­cus. Nikon’s sup­port ser­vices say they can’t help be­cause they don’t sup­port third-party lenses. What can I do? Luiz Bar­rella, via email

NPhoto - - Niko Pedia Q & A -

Ja­son says... Due to the ap­pli­ca­tion of Nikon’s re­cent firmware re­lease, some Sigma lenses will need an up­date. For ‘Global Vi­sion’ lenses in the Art, Con­tem­po­rary and Sport lines, own­ers can ap­ply up­dates di­rectly to the lenses, via Sigma’s USB Dock. This is avail­able to buy for around £40/$60, and con­nects the lens to a Mac OS- or Win­dows­based com­puter. For other lenses, or in the ab­sence of a USB Dock, cus­tomers can send their lenses to a lo­cal Sigma re­pair cen­tre for a free up­date. The re­pair cen­tres are listed at www.sigma-photo.co.jp/english/net­work

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