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I own the standard nikon d3100 and while it is a great camera it has had its problems. As far as support goes the canon cameras have far better tethering support, I think that higher end nikons also have this though. For me to get tethering to work I needed to buy a shoestring astronomy shutter controler. If you are thinking of connecting your camera to a telescope then a larger frame may not be better because you will need more equipment to combat vignetting.
I think for wide field astrophotography using a lens both cameras will serve you well and it is a holden ford competition where peoples opinions influence their decisions.
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