Quote:
Originally Posted by Peter Ward
Yes, putting a star cluster off axis shows up as curvature in CCDI. (trial copies are available as free downloads....good fun to play with)
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Yes I have experienced that as well. For CCDIS to be effective you have to pick a homogeneous field devoid of any bright stars or nebulosity. A cluster for sure will bugger things up. I did such a field centered on NGC104 once and the field was bell shaped.