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Quantaray has made several different 70-300mm lenses so I'm not sure exactly which one you have. However, if the lens doesn't have a AF/M switch it's no big deal. Assuming it's an autofocus lens, it's always on. If you want to switch to manual focus, flip the switch on the camera body.
If it's an older manual-focus Quantaray lens then the question is moot.
Quantaray makes their lenses with a variety of camera mounts. A lens with a Nikon mount, for example, will not work on a Canon body. As long as you get the lens with a Canon mount, it will work with the 5D MKII.
It is because the lense is only an AF lense. The d40x doesn't have an on-body auto focus motor so that needs to be on the lense. I have a d60 and have the same problems. You can use the manual focus on the AF lenses; however, to use auto focus, you need to buy an AF-S lense. It's disappointing I know, but that's the price we must pay for saving on our body lol
It depends on the mount. Quantaray lenses are available for a wide variety of mounts. If you specifically buy the one with the Nikon mount, then it will work. If you buy one with, say a Canon mount, then it won't fit.
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.
Your camera is only compatable with AFS-type lenses because it has no screw-drive motor. You can only use AFS Nikkors and Sigma HSM lenses (the lens actually has a motor inside). You were misinformed. Bring the lens back and ask for a refund. Take that money and purchase a compatable lens somewhere else.
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