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From dark and moderately steady skies Rigel is easy in the 102mm frac at 100X. Same with splitting Acrux A & B, a good 60mm will do it. Adhara is a harder split because of the mag. of the secondary, needs 150mm + and transparent skies. Sirius is another step up, think I've spotted the Pup with a 200mm newt / dob a few times.
Have seen Trap E & F in the 127mm apo in clean skies with sufficient mag. to seperate E from A and F from C . And it's clear outside tonight so may have another browse around that area just to double check.
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