Get the IDAS filter.
Even on an unmodded camera, it helps heaps.
If you get the 2" filter, you can screw it anywhere in to the image train (I had mine screwed in to an OAG, but you can put it just about anywhere.
If you're keen and want to do REALLY wide fields, you can even get an adapter that will screw on to the front of a camera lens (I got one from Mogg Adapters)
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