Will my quantaray tech-10 NF AF zoom lens (for me

Hi Nicolas.
Normally, this problem comes from a loose screw and roller that makes the mechanism gets stucked.

Quantaray lenses are available with a variety of mounts. Assuming you get one with a Nikon mount, then yes, it will work with a Nikon camera. However, unless the lens has a focusing motor, it will not autofocus on the D3000. Some Quantaray lenses have such a motor, some do not.

Those lenses will fit on every Nikon digital SLR. However, the autofocus will only work on cameras with an autofocus motor, the the AF will not work on the D40, D40x, D60, D3000, D3100, D5000, and D5100. Note that this is just the focusing: if you're willing to focus manually then those lenses will work perfectly well on those cameras.

Due to the smaller image sensor of most digital cameras, the lenses will act as if they were about 1.5 times longer. Thus a 50mm lens on a digital camera will give about the same field of view as a 75mm lens would on a film camera. This applies to all Nikon dSLRs except for the D3 family and the D700, which behave in this respect like a 35mm film camera.

You have to decide what's affordable for you, balancing such factors as weight, ease-of-use, and of course cost.

You can see the current Nikon lineup at
http://www.nikonusa.com/Nikon-Products/Digital-SLR-Cameras/index.page

No. The lens will work with every Nikon film or digital SLR made in the past three decades or so, though of course the autofocus won't work on older cameras that don't support AF.

Yes, assuming we're discussing SLR cameras. It can also be used with most Nikon film SLRs.

Yes, they will work. As you pointed out, they will not autofocus, but everything else will work, most importantly the exposure metering.

Bear in mind that the D5000 sensor is smaller than a frame of 35mm film. The lenses will seem longer on the D5000, about the equivalent of 42-120mm and 105-450mm. This means that the shorter lens won't really be a wide-angle anymore, though the longer lens will now be a whopping telephoto.

The D40 does not have a focus motor, instead relying on a motor in the lens. This lens does not have such a focus motor, and thus will not autofocus with the D40.

I WENT TO B&H PHOTO AND GOT THE ANSWER FROM THEM.

Quantaray is a private label lens made for Ritz Camera. They make this lens to fit several different camera brands including Nikon and Canon. The only ones that will fit a Canon camera body are the ones with the Canon EOS mount. If your Quantaray lens doesn't have an EOS mount, then it won't work on your Canon camera. You can take the lens to any Ritz Camera location and they can help determine which mount it has, and which cameras it will fit.