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Omaroo, thanks for that when I've taken shots for focussing I try what you described firstly although I've never been able to get a perfectly round fuzzy circle although close and I get tiny little lumps at 0,90,180, etc is this usual through the 80ED.
Also I've made up one of these masks but even with it have'nt had a great success but I need to percervier.
Thanks again
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