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Thanks all
Steve - Myastroshop has suggested some Flattener options for my Orion ED102,
"Perhaps the William Optics 2" APO Adjustable field flattener for 500-1000mm focal length refractors (about $449 GST inc) or a HOTECH 2-inch flattener (about $240 GST inc)."
Steve has been brilliant - very helpful. Also suggested that I loose the extension tube - so will give that a try as soon as the sky improves.
Cheer Petra d.
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