And here's my 24" observation made in mid-August 2015 at Grandview campground in the White Mountains (elevation 8600') to the east of the Sierras. Our group included Jimi and Connie, Paul Alsing and Debbie, Mark Wagner, Richard Navarette and Al Smith.
At 260x; fairly bright, fairly large, elongated 3:2 SSW-NNE. There are three distinct zones. Towards the center is a sharply concentrated, bright, elongated 2:1 nucleus. The nucleus is surrounded by an oval central region, roughly 1.5'x1.0'. The central region is surrounded by a large, very low surface brightness halo, extending ~4.0'x2.5'. Although spiral structure wasn't seen, the outer regions were noted as irregular. A mag 12.5 star is on the northeast side of the halo, 1.8' from center, and a mag 13.3 star is 1.3' SE of center.