A lot of doubles, you know, you get the right Eyepiece for the scope and the subject at hand and physics and beauty unfolds. Here's a double that unpacks itself the deeper you go.
Ok at first it's an assymetric Double-Double at 41x. Clear, though not too bright with the C90. You see Xi Scorpii as a double with a fainter partner nearby at 7.5". Nearby at almost 5' a wide cream double at 11.9". It's a nice field - and it could just that and worth the look. But going to another level at 167x the creamy primary belies it's duplicity . Closer attention reveals the airydisc is elongated and at 1.1" to my Dawes 1.34" there could be no Dawes Notch to hope to see. Helping the elongation becoming evident was the elongated first diffraction ring. Normally my 8" would make easy work of this but here the C90 in with its own Rayleigh Criteria defining the task, it presented a bit if a challenge. The fun of working with the little optic.