Is Quantaray NF AF work with Nikon D3000 - Quantaray 28-200MM F3.8-5.6 Lens for Canon AF

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

Sorry, no. This lens relies on the camera having an autofocus motor, while the D3000 will only autofocus with lenses having their own autofocus motor.

For Nikon AF and manual focus SLRs. The compatible T Mount System makes it possible to use most any single lens reflex camera in combination with various front camera attachments such as telescopes, mirror lenses and slide duplicators. The T Mount is a metal connector that screws onto the compatible front attachment and allows this combination to be coupled to the SLR camera lens mount.

The Nikon lens, absolutely.

Quantaray makes their lenses with a variety of mounts. A lens with a Canon mount, for example, will not fit on the D3000. Assuming the lens has a Nikon mount, then yes, it will work with the D3000.

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

Quantaray makes their lenses available for a variety of camera brands. If the lens has a Canon mount, then no. If the lens has a Nikon mount, then yes.

Also, bear in mind that if the lens does not have an internal focusing motor then you will not get autofocusing with the D3000. Everything else will still work, but you'll just have to focus manually.

Only if you get the version with the built-in autofocus motor. The D3000 lacks a mechanical AF coupling so AF lenses which need to be driven by a motor in the camera body will require manual focussing.

Either way, you're far better manually focussing the Quantaray/Tamron 70-300mm: the AF performance is very slow, very noisy and hunts around a lot to achieve focus.

Although the Quantaray and Tamron versions are identical lenses, if you have to buy this low-quality budget model then go for the Tamron: it's absolutely no better lens quality (and usually the same price), but the manufacturer's warranty from Tamron is much better than Ritz and is internationally valid. If you resell the lens then the Tamron will have some value (not much though) and the Quantaray will be near worthless as it's not so widely known, and has a poor reputation amongst those familiar with the brand.

"Cheap" isn't always the same as "good value"...

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.

Yes, with caveats. The autofocus won't work on D40/D60/D3000/D5000. The metering may not work in all modes on all cameras. Since you didn't specify which camera, I can't give you a better answer than that.

I have 30-year-old Nikon lenses working fine on my D90, but without metering. And the old lenses date before the invention of autofocus.

Yes, the Quantaray Autofocus lens will focus automatically on the D80.