I just got the Nikon D3100. Will the Quantaray 600-1000mm work in AF mode or just Manual?
The lens is a manual focus lens. It doesn't matter which mode you have the camera in, you'll still have to focus it yourself.
SOURCE: I have a Quantaray 28-200 mm f/3.8-5.6 AF Zoom
The Nikon D40 requires the use of AF-S/AF-I lenses. Here is a chart of lens compatibility for Nikon SLRs:
Nikonian.org
SOURCE: quantaray 2x AF for Nikon
A 2x tele-extender will rob you of two stops of light. This is simply a matter of physics: you're looking at only one quarter of the scene, so you'll only get one quarter of the light.
You specified neither the camera body you're using nor the lens you're using the tele-extender with. Most Nikon bodies will not autofocus with lenses slower than F/5.6. (Actually, they might, but F/5.6 is what Nikon specifies.) With the two-step penalty, a lens would have to be F/2.8 or faster in order to autofocus.
The solution is to either get a faster lens ($2000 or so) or to switch off the autofocus and go manual.
SOURCE: Can the quantaray for Nikon
Yes, assuming we're discussing SLR cameras. It can also be used with most Nikon film SLRs.
SOURCE: Quantaray Tech-10 Camera Telephoto lens 75-300mm is it work in Nikon D3100?
Quantaray makes their lenses with a variety of mounts. As long as you get a lens with a Nikon mount then it will work on the D3100.
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.
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