Traditional Culture Encyclopedia - Photography and portraiture - Why can't Nikon D90 be photographed?

Why can't Nikon D90 be photographed?

Generally speaking, the interface between the D90 and the lens is not strong enough. This happened twice on my new machine and new mirror, which is a bit annoying. Usually you turn off your cell phone, remove the lens and get better indirectly. If it appears again, clean the electric shock part of the fuselage and the lens. If it still appears frequently ... how to go to the maintenance center for testing? I hope we can all solve this problem. F-flash means that the lens of the fuselage cannot infer the aperture value of the lens because of poor contact.