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Yes. I have one and it works perfectly on my D90. If you get the version with an aperture ring, be sure to set the aperture to its smallest setting (f/22) and lock it. You control the aperture from the camera, the same way as on a lens without an aperture ring. If you get the version without an aperture ring, don't worry about it.
The lock that's around the 4-way button that moves the AF point will stop it from moving. The AF switch (says C,S,M) on the body below the lens release button gets knocked to manual and turns off the AF
Mirror lenses have no aperture nor AF, so they mount via a T mount. A $30 item that screws on the end of a mirror lens that fits your camera. A mirror lens has it's physical likes and dislikes against a glass 500mm. A glass 500mm will give a better image if you can stop down to F8 F16. Then you have shutter speeds to consider and those lenses are usually connected to the camera's contacts. So they can be specific to a single body. There are older Tamron lenses that take Adaptall mounts, they are old and hard to find. But they solved the multiple body problems for "auto" program lenses. None had AF, when AF camera around, we were back to individual lenses per body.
Sorry this is too late, perhaps it will be useful to others. I hope you used a different lens for the wedding!
You can't use the 50mm 1.8 lens on the D40x unless you focus manually. This is because the D40x only supports autofocus with AF-S and AF-I lenses. The focus motor and drive mechanism for other AF lenses was omitted to make the camera smaller, lighter and cheaper.
You need AF-S or AF-I Lenses. These have the autofocus motor built in to the lense. The D40 and D40x does not have an autofocus motor in the camera body itself, while the D80, D300, D3 Etc to have the motor in the camera. You can use most old lenses on your D40x, but you will have to focus them manually.
See Ken Rockwells page for a lot of D40 / D40x info http://www.kenrockwell.com/nikon/d40.htm
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