My DSC-F717 worked fine for the first year, but in the past two months the auto focus has repeatedly stopped working. It beeps to indicate that it is focused, but it is not. Auto focus works fine in macro mode, but not in normal mode.
I called Sony tech support and they suggested a reset, which corrects the problem, but it reoccurs without notice.
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Re: DSC-F717 autofocus stops working
I was first going to also suggest a reset.
Does your manual focus function correctly from near to far(turning the focus ring in manual) and does the wide to tele motion function fully and smoothly? (lens adjustability without restriction)
Was your camera exposed to extreme heat or elements?(beach sand or water of any kind)
It may mean electronics only or a mechanical restriction causing an electronic malfunction.
A last resort may mean your closer documenting when or how frequent it happens and maybe ultimately a trip (for your camera) to Sony.
Get a price quote for repair since you might strike a happy medium of using the camera differently (manually focussing) without exceeding the value of the camera for repair costs.
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The lock that's around the 4-way button that moves the AF point will stop it from moving. The AF switch (says C,S,M) on the body below the lens release button gets knocked to manual and turns off the AF
Sounds like you need to get your camera fixed by Nikon.
However, you say the auto focus stopped working, you didn't switch to a lens that uses a mechanical focus linkage do you? The D40 only supports lenses with AF-S or AF-I type autofocus drives. AF-D and AF-G types without AF-S or AF-I don't autofocus.
Also, check that the A/M switch on the lens is in the correct position.
Manual focusing is quite difficult to do accurately with an AF camera. The screen inside the camera is not optimized for this. If you are sure you are focusing accurately but the pictures you take are still out of focus, the mirror may need adjusting. I can provide further info on this if you require, but if you're within warranty, i'd recommend that route first.