Q2 earnings were fine, but guidance took investors' focus today.Shares of Corning (GLW -7.10%) fell as much as 11.9% in trading on Tuesday after the company reported second-quarter financial results. Shares are down 8.2% as of 3 p.m. ET.An earnings beat but a guidance flopCorning reported a modest 3.4% increase in revenue to $3.6 billion and non-GAAP (adjusted) earnings per share was $0.47, which met analyst estimates. But the company guided for $3.7 billion in revenue and earnings of $0.50 to $0.54 per sha ...