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Lens motor(inside the lens) could be damaged already. The D40x focusing system is dependent on the lens, just like any other Nikon Dx camera except for the ones that has built-in motor to its body, e.g. D90, D7000. Try a different lens, most likely it should work
Sorry, but the D40x lacks an autofocus motor, depending on the lens to have one. Nikon calls such lenses AF-S. This particular lens does not have such a motor, relying on the camera to have one. The only 50mm lens currently available with an autofocus motor is this one:
http://www.nikonusa.com/Nikon-Products/Product/Camera-Lenses/2180/AF-S-NIKKOR-50mm-f%252F1.4G.html
Earlier this week the Nikon web site listed a new 50mm F1.8 lens with an autofocus motor, but then it was removed. Hopefully they will officially announce this lens soon.
Turn the mode dial to M for Manual. You'll lose all through-the-lens metering capability, so you'll have to review your pictures or else use another light meter.
The camera is spec'd to autofocus with lenses that are f/5.6 and faster. The conversion lens is costing you two stops, so it's a wonder you're getting any autofocusing at all with a lens slower than f/2.8.
Unfortunately, it's tough to try to get around the laws of physics. You're just going to have to focus manually.
We tried the same lens on another Nikon (D90) and auto focus did not work.
We mounted a new set of lens on the original D40x, and it worked.
Turns out the 2 year Nikon lens (18mm-135mm) was bad. Nikon lens have a 5 year warrantee. The lens will be sent back to Nikon with no service or shipping charge.
Is there a piece of tape across the lens contacts, like the film over a print cartridge head? I would think that is the only communication between the lens and the body.
Usually tele lenses need longer exposure,and mirror lenses need more than normal lenses.Try with 1sec, half sec,( 2 in the speed dial, not 2" ) or quarter sec (4 in the speed dial) exposures.
One more thing, you need good sturdy stands to hold cameras.
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