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The Tuneable paracorr is a wonderful thing - it improves the image right across the field. Some people say they can't see a difference, but I have never found that to be the case when I pass them mine. If you are fussy about coma, then it's a must.
Other than that, a 2x barlow or 2.5x powermate should complete your collection for the moment. (thats not entirely true - you need a good 35mm).
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