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A 200 or 300mm fast lens (F/2.5-F/3.5) is great for wide field work. Just attach the DSLR, no focal reducers or flatners required. Its the most basic form. You could perhaps use a zoom lens, though would suggest avoiding these. Fixed focal lengths are the way to go.
I would suggest you consider the mount and how you intend to guide. Once biten by the astrophotography bug, you'll want to use a longer focal length or different camera. A good mount will see you through your astrophotography journey.
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