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A. B. A - B. Sky cancellation: ‘nod and shuffle’. Storage of ‘sky’ image next to object image via ‘charge shuffling’ Zero extra noise introduced, rapid switching (60s). Typically A=60s/15 cy: 1800s exposure 10 -3 subtraction. Another example.
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A B A-B Sky cancellation: ‘nod and shuffle’ Storage of ‘sky’ image next to object image via ‘charge shuffling’Zero extra noise introduced, rapid switching (60s) Typically A=60s/15 cy: 1800s exposure10-3 subtraction