Having another go at this tonight. 12" dob under a good sky (for here) and with M57 practically overhead. No luck with the central star but I've managed to see and hold with direct vision stars marked below (red arrows) down to mag 14.7 which is the best I've done I think. Another .5 mag to go and bingo ! Eyepieces used range from Leica ASPH zoom at 8.9mm (179x) to Pentax XW 3.5mm (454x). For me, the faintest stars were easier at the higher magnifications. Incidentally the Nagler
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