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Re original OP....
I used a 320mm f5 (1560mm fl) - Canopus 320 for many years in the 80's to visually check many, many of Greg Thompson's initial draft "Supernovae search charts" down to 15.5 mag. Generally a 12.5mm UO Ortho eyepiece....
Would be interesting to see how this would perform with today's CCD's.
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