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I might add a few things, although I agree with H, you can still produce great results from nikon dslr camera. I am not being biased here as I have both nikons and canons
It is the unfortunate fact that canon has taken this market. A couple of reasons below
-infamous star eater plaguing nikon cameras where stars can be mistaken as noise and processed out of the raw image, - canons don't do this.
-plenty of third party support with canon cameras. E.g clip in filters, software, modifications services.
Doing some research, the one main competitor was when the d70 was around. Since then, it has gradually started to phase out.
But to answer your question, which H already answered, you need a t-ring and threaded 2" coupler. Don't bother with 1 1/4 inch as you will produce vignetting.
As you want to try planetary with your d40x, you would be limited to the moon but I can say, my nikon d40 did produce stunning moon images.
Rob
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